Notice: The following article provides technical and regulatory-based information intended for cleanup and restoration contractors, insurance adjusters, and industrial hygienists who evaluate or have exposure to buildings damaged or contaminated by wildfires and wildland-urban interface (WUI) fires. These professionals are often required to address questions related to wind, heat, and smoke intrusion into buildings, the types of damage resulting from these conditions, and the technical and regulatory considerations that inform decisions are based regarding cleaning, remediation, or material replacement.

The focus of the article comes from incidents the author has directly observed, investigated, sampled, and reported on over the past ten years in California. These experiences include field assessments, environmental sampling, laboratory data interpretation, and preparation of technical reports for multiple stakeholders, including property owners, insurers, legal representatives, and restoration contractors.

Although specific references to California regulations and guidance are included, the technical principles, contamination mechanisms, exposure considerations, and general remediation concepts discussed are broadly applicable to wildfire and WUI fire events in other states and jurisdictions.

Due to the scope and complexity, the article is presented as a multi-part series. This is Part 1, where subsequent sections are identified as Part 2 through Part 6. They will be issued in the coming months and will further address fire behavior, contamination mechanisms, exposure pathways, sampling methodologies, and remediation considerations associated with wildfire and WUI fire events.

While the information and references were accurate at the time of writing, it is the readers’ responsibility to complete their own research as it relates to a particular fire loss jobsite.

INTRODUCTION

1.1 Wildfires vs. Wildland-Urban Interface (WUI) Fires:

1. Wildfires and WUI fires are related but distinct concepts that are important when evaluating contamination, exposure, and remediation following fire events.
2. A wildfire is the broader term for an unplanned fire burning in wildland fuels, including grass, brush, chaparral, forests, or other vegetative fuel sources. The wildland-urban interface, by contrast, is not a separate fuel type, but a geographic and environmental condition where structures and human development meet or intermingle with undeveloped wildland or vegetative fuels.
3. The U.S. Fire Administration (USFA) defines the WUI as the zone of transition between unoccupied land and human development^[1]. The National Fire Protection Association (NFPA) describes wildfire as a wildland fire originating from unplanned ignition sources, including lightning or human activity, and typically burning in vegetative fuels such as grass, brush, or forest ^[2].
4. WUI fires create a distinct and more hazardous smoke profile compared to typical vegetation-only wildfires. Because WUI fires burn through residential and commercial areas, they combust synthetic materials, vehicles, treated building products, and household chemicals, producing a complex mixture of contaminants^[3].
5. A WUI fire is therefore a wildfire that occurs within, spreads into, or impacts this interface or intermix zone. Unlike vegetation-only wildfire smoke, WUI fire smoke includes combustion byproducts from structures, vehicles, plastics, treated wood, electronics, household contents, and other anthropogenic materials. This distinction is critical because WUI fires may produce a more complex contaminant mixture than wildland vegetation fires alone^[4].

1.2 California Regulatory Framework Relevant to WUI Fire Conditions:

California regulatory agencies recognize that WUI fire environments present increased hazards due to the presence of toxic combustion byproducts and environmental contamination. California Environmental Protection Agency (Cal/EPA) and California Department of Public Health (CDPH) acknowledge that wildfire and post-fire environments may contain hazardous substances, including heavy metals such as lead, arsenic, and cadmium, resulting from the combustion of residential, commercial, and vehicular materials^[5]. California OSHA (Cal/OSHA) also recognizes that structure fire ash and debris may contain amounts of lead, cadmium, chromium, mercury, arsenic, and other heavy metals^[6].

Worker protection requirements are governed by applicable federal and Cal/OSHA regulations. In California, depending on the workplace hazard and work conditions, Cal/OSHA regulations include but are not necessarily limited to California Code of Regulations (CCR’s) §5194 (Hazard Communication), §5141 (Control of Harmful Exposure to Employees), §3380 (Personal Protective Equipment), §1532.1 (Lead), §5141.1 (Protection from Wildfire Smoke), §3203 (Injury and Illness Prevention Program), §5144 (Respiratory Protection), §5155 (Airborne Contaminants), §5192 (Hazardous Waste Operations), §1529 (Asbestos), §1530/1531 (Silica and Dust), §3395 (Heat Illness Prevention), §3363 (First Aid and Emergency Care), §1527/3364 (Sanitary Facility), §5162 (Emergency Eyewash), §1512 (Emergency Action Plans), §1675/3276 (Ladders), and the §6400/6404 (General Duty Clause). These regulations and others require employers to evaluate hazardous substances, communicate hazards, provide appropriate protective equipment, and assess employee exposure where lead or other hazardous contaminants may be present^[6][7].

Except for lead and asbestos, there are no comprehensive published residential clearance standards for hazardous substances associated with WUI fire contamination^[8]. If the building was completely or partially consumed, or heat energy entered the building, the most common hazardous materials that can remain heat or moisture reactive or explode and injure workers, include batteries, light ballasts, freon in condensers and compressors, propane tanks, solvents, containers and cans under pressure, pesticides, herbicides, and fertilizers.

Occupational exposure limits and regulatory standards for chemicals may be useful points of reference, but they are not equivalent to residential health-based standards. Occupational limits are generally designed around an adult worker whose exposure is for defined work periods, such as an 8-hour workday. They do not adequately account for residential occupants, including infants, children, elderly persons, immune-compromised individuals, or pets who occupy a home for more than 8-hours, nor do they account for workers having limited exposure when inspecting or working in a WUI fire contaminated building. In other words, there is no single California or federal regulation that establishes a universal “limited exposure time” specifically for workers entering a wildfire or WUI fire contaminated building. It is up to the employer to make sure workers have a safe workplace that will not injure them. (California CCR §5141)

1.3 Technical Distinction and Relevance in Completing a Contamination Assessment: 

The distinction between wildfire and WUI fire is essential when evaluating contamination, exposure pathways, and remediation limitations. Vegetation-only wildfires primarily generate combustion byproducts derived from biomass fuels, including cellulose, lignin, and naturally occurring organic compounds. These emissions are generally characterized by particulate matter (PM 10, PM2.5), carbon monoxide (CO), carbon dioxide (CO₂), and products of incomplete combustion such as volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs).

In contrast, WUI fires involve the combustion of both vegetative fuels and anthropogenic materials associated with the built environment. These materials include structural components (e.g., wood framing, engineered wood products, insulation, roofing materials), synthetic polymers (e.g., plastics such as polyvinyl chloride (PVC), polyethylene, polyurethane foams), household contents (e.g., electronics, furnishings, textiles), and treated or coated materials (e.g., paints, adhesives, flame retardants, sealants). The combustion of these materials produces a significantly more complex and toxic mixture of contaminants.

Scientific literature and government agency confirm that WUI fire smoke contains, in addition to typical biomass combustion products, a broad range of hazardous substances including semi-volatile organic compounds (SVOCs), halogenated compounds, heavy metals (e.g., lead, arsenic, cadmium), dioxins, and furans. Contaminants arise from the thermal degradation and incomplete combustion of synthetic and chemically treated materials. As a result, WUI fire emissions present a higher toxicological burden and greater potential for long-term environmental persistence compared to vegetation-only wildfire emissions. 

The presence of these anthropogenic (manmade, constructed, engineered) combustion byproducts directly affects exposure pathways. Fine and ultrafine particulate matter (PM10, PM2.5, and ultra-fine particles) can transport adsorbed toxic compounds deep into building assemblies through pressure-driven airflow, including wind-induced infiltration, thermal buoyancy (stack effect), and mechanical ventilation systems. Once deposited, these contaminants can adhere to interior surfaces, penetrate porous and semi-porous materials, and become reservoirs for long-term re-emission and occupant exposure.

From a remediation standpoint, the distinction is critical. Biomass-derived residues may be more amenable to conventional cleaning methods under limited exposure conditions. However, WUI-derived contamination involving synthetic combustion byproducts, heavy metals, and persistent organic pollutants introduces significant limitations to cleaning efficacy. Porous and semi-porous materials, including textiles, insulation, and composite building materials, may retain contaminants at a microscopic level that cannot be fully removed through standard cleaning processes. This condition supports the position that cleaning may reduce contaminant levels but does not necessarily restore materials to pre-loss conditions or eliminate exposure risks.

1.4 Summary:

• Wildfire is the general term for an unplanned fire burning in wildland fuels.
• A wildland-urban interface fire is a wildfire that occurs where structures and human development meet or intermingle with wildland vegetation.
• Not every wildfire is a WUI fire; however, every WUI fire involves wildfire exposure within or adjacent to the built environment. This distinction is important because WUI fires involve both vegetative and anthropogenic fuels, creating more complex contamination concerns than vegetation-only wildfire smoke.
• For WUI fire assessments, the presence of heavy metals, PAHs, VOCs, SVOCs, dioxins, furans, and other combustion byproducts must be evaluated in relation to exposure pathways, worker protection, occupant health, sampling limitations, and remediation feasibility of removing them from buildings, HVAC systems, and contents.

Technical References:

[1] U.S. Fire Administration (USFA) “Wildland Urban Interface definition: What is a WUI?”

[2] National Fire Protection Association (NFPA) “What Exactly is a Wildfire?” McGowan, M., 2024

[3] USEPA “Wildland Fire Research: What’s in Smoke,” 2025

[4] Holder, A., et al. “Hazardous air pollution emissions estimates from wildfires in the wildland-urban interface” PNAS Nexus, 2023

[5] California Department of Public Health (CDPH) “Wildfire Cleanup: Considerations for California’s Public Health Officials,” 2019

[6] Cal/OSHA “Work Safety and Health During Fire Cleanup,” 2025

[7] Cal/OSHA, CCR Title 8 §5194 Hazard Communication; §3380 Personal Protective Devices; §1532.1 Lead

[8] Goftari, E., et al. “Post-Wildfire Indoor Pollution in WUI Areas following the 2025 Los Angeles Fires. Part 1. Establishing Baseline Contaminant Levels Prior to Home Reoccupation,” 2025

[9] CARB/EPA/SCAQMD/CDPH “Understanding Air Quality After the LA Fires,” Webinar Presentation, 2025

[10] U.S. EPA “Wildfires and Indoor Air Quality,” (updated 2026)

2.0 COMBUSTION BYPRODUCTS COMMONLY RELEASED DURING A WUI FIRE

2.1 Fire Generated Smoke and Characteristics:

Combustion byproducts (CBP) released during a WUI fire are derived from the burning of both vegetative fuels and anthropogenic (built-environment) materials, resulting in a chemically complex mixture of gases, particulate matter, and organic and inorganic contaminants. USEPA identifies wildfire and WUI smoke as a complex mixture of particulate matter (PM10, PM2.5), CO, NOₓ, VOCs, and PAHs, all of which are primary components of combustion-generated smoke^[1]. Scientific literature further establishes that WUI fire emissions differ significantly from vegetation-only wildfires due to the inclusion of structural and synthetic materials. The National Academies of Sciences, Engineering, and Medicine (NASEM) confirms that WUI fire smoke contains additional hazardous constituents, including heavy metals, asbestos, fibrous particulates, halogenated hydrocarbons, and residual chemicals associated with the combustion of residential and commercial materials^[2]. Atmospheric research from the National Oceanic and Atmospheric Administration (NOAA) demonstrates that fuel composition directly influences emission chemistry, and that WUI fires produce particulate matter containing a broader and more toxic mixture of chemical species compared to fires involving only natural vegetation^[3].

As mentioned, but worth noting, California regulatory agencies, including the Cal/EPA and CDPH, recognize that wildfire and post-fire environments, particularly in WUI settings, contain hazardous substances such as toxic metals (e.g., lead, arsenic, cadmium), combustion byproducts, and persistent environmental contaminants generated from the burning of structures, vehicles, and synthetic materials^[4]. Under the Cal/OSHA safety framework for workers exposed to these contaminants, their emissions constitute hazardous exposures. Cal/OSHA requires evaluation and control of hazards. These regulations recognize that airborne contaminants generated from combustion present inhalation and dermal exposure risks requiring appropriate protective measures^[5].

2.2 Composition of WUI Fire Emissions:

Wildfire and WUI fire contaminants are generated through incomplete combustion and thermal degradation of both natural biomass and synthetic materials present in the built environment. Based on regulatory guidance and peer-reviewed research, combustion byproducts commonly associated with WUI fires include:

• Particulate matter (PM10, PM2.5, and ultrafine particles)
• Carbon monoxide (CO)
• Nitrogen oxides (NOₓ)
• Volatile organic compounds (VOCs)
• Semi-volatile organic compounds (SVOCs)
• Polycyclic aromatic hydrocarbons (PAHs)
• Halogenated hydrocarbons
• Dioxins and furans (formed under incomplete combustion conditions)
• Heavy metals, such as lead, arsenic, cadmium, chromium, and mercury 
• Fibrous materials, including asbestos (depending on building age and materials)

2.3 Technical Significance in California WUI Fires:

Unlike vegetation-only wildfire smoke, which is primarily composed of biomass combustion products, WUI fire emissions contain additional toxic constituents that are persistent, capable of adhering to surfaces, and penetrating porous materials, thereby increasing the difficulty of remediation and the potential for prolonged exposure. The inclusion of anthropogenic (human created) fuel sources in WUI fires, such as plastics, treated wood, electronics, building materials, and vehicles, results in:

• Increased concentrations of hazardous air pollutants
• Greater chemical diversity and complexity of emissions
• Increased toxicity of particulate matter
• Formation of persistent and adhesive contaminants
• Deposition of complex contaminant mixtures onto structures and contents

2.4 Summary:

• Combustion byproducts released during California WUI fires consist of a complex mixture of particulate matter, gases, and organic and inorganic contaminants generated from the burning of both natural vegetation and anthropogenic materials. These contaminants commonly include particulate matter (PM2.5), carbon monoxide, volatile organic compounds, polycyclic aromatic hydrocarbons, dioxins, furans, and heavy metals.
• The inclusion of structural and synthetic materials in WUI fires results in elevated concentrations of hazardous air pollutants and a more chemically diverse and toxic emission profile compared to vegetation-only wildfires. This distinction is recognized by federal and California regulatory agencies and is critical for evaluating contamination pathways, exposure risks, and limitations of remediation practices following a WUI fire event.

Technical References:

[1] U.S. Environmental Protection Agency (EPA) “Wildland Fire Research: What’s in Smoke?”

[2] National Academies of Sciences, Engineering, and Medicine (NASEM) “The Chemistry of Fires at the Wildland-Urban Interface,” 2022

[3] National Oceanic and Atmospheric Administration (NOAA) “Wildfire Smoke Chemistry and Atmospheric Research”

[4] California Environmental Protection Agency; California Department of Public Health (CDPH) “Post-Fire Environmental Health Guidance”

[5] California Code of Regulations, Title 8 §§5194, 5141, 3380

3.0 WUI FIRES GENERATE ELEVATED HEAT AND HIGH TEMPERATURE

3.1 About Fuels That Create High Temperatures:

WUI fires generate elevated heat release rates and high-temperature conditions due to the combined combustion of vegetative fuels and anthropogenic (built-environment) materials, including structural components and contents. Materials such as dimensional lumber, engineered wood products, plastics, furnishings, and petroleum-based products significantly increase overall fuel loading and alter combustion behavior. NACEM identifies that fuels present in WUI environments differ substantially from natural vegetation in chemical composition, density, and configuration. These differences directly influence combustion reaction pathways and heat release characteristics, resulting in increased fire intensity, higher heat release rates, and more complex burning conditions compared to vegetation-only fires^[1].

Structure fires within WUI environments are a primary contributor to elevated thermal energy. Research from the UL Fire Safety Research Institute demonstrates that post-flashover conditions in residential structures produce substantial radiant heat flux capable of igniting adjacent materials and structures. Once structures become involved, radiant and convective heat transfer become dominant mechanisms driving fire spread in WUI communities[2]. Combustion of building materials and contents further intensifies these thermal conditions. Structural assemblies and interior contents act as high-energy fuel sources, sustaining elevated temperatures that frequently exceed those observed in vegetation-only wildfires.

Additional intermediate fuels, such as vehicles, batteries, decks, fencing, propane tanks, fertilizers, and stored combustible materials, they further increase heat generation and exposure intensity^[2].

Fire science and engineering studies confirm that such elevated temperatures are sufficient to degrade, deform, and cause failure of structural materials. Thermal effects include expansion, cracking, loss of mechanical strength, delamination, and eventual structural failure. High-temperature combustion conditions also enhance the formation, volatilization, and transport of hazardous combustion byproducts, contributing to the complex contaminant profile associated with WUI fires^[2][3].

California regulatory agencies recognize the hazards associated with WUI fire environments. Cal/OSHA requires employers to evaluate and control worker exposure to thermal hazards, airborne contaminants, and fire-related conditions as previously stated. These regulations mandate implementation of protective measures to reduce risks associated with high-temperature environments and combustion-generated contaminants^[4]. Additionally, the Cal/EPA and Cal/DPH recognize that high-temperature combustion of structures contributes to the formation and release of hazardous substances, including toxic metals and persistent environmental contaminants, which may deposit onto buildings and contents following a WUI fire^[5].

3.2 Generated Heat During WUI Fire Conditions:

The inclusion of structural materials and contents in WUI fires results in:

• Increased fuel load density
• Higher heat release rates (HRR)
• Sustained high-temperature combustion conditions
• Increased radiant and convective heat transfer
• Enhanced ignition potential of adjacent materials and structures
• Prolonged heat exposure duration due to continuous fuel availability

Collectively, heat and thermal pressures produce a more severe, sustained, and energetically intense thermal environment than that associated with vegetation-only wildfire events^[1][6][7].

3.3 Summary:

• WUI fires generate elevated heat release rates and high-temperature conditions due to the combined combustion of vegetative fuels and structural materials. The inclusion of building components and contents increases fuel loading, alters combustion chemistry, and results in higher heat release rates and more complex fire behavior.
• Post-flashover structure fires within WUI environments generate significant radiant and convective heat capable of igniting adjacent materials and structures, thereby sustaining high-temperature conditions and contributing to rapid fire spread within developed areas.
• Thermal conditions in WUI fires frequently exceed those associated with vegetation-only wildfires and represent a critical factor in evaluating structural damage, material degradation, contaminant generation, and human exposure risk in California WUI fire events.

Technical References:

[1] National Academies of Sciences, Engineering, and Medicine – The Chemistry of Fires at the Wildland–Urban Interface, 2022

[2] UL Fire Safety Research Institute “Residential Fire Dynamics and Post-Flashover Research”

[3] Fire science and engineering literature on high-temperature combustion and material degradation

[4] Cal/OSHA CCR Title 8 §§5141, 3395, 3380

[5] California Environmental Protection Agency; California Department of Public Health “Post-Fire Environmental Health Guidance”

[6] Eissa, O., et al. “The effect of fuel structure and wind speed on ignition behavior and fire spread of wildland fuels under firebrand exposure,” Journal of Fire Sciences, 2026

[7] Kwon, B., et al. “Ignition propensity of structural materials exposed to multiple firebrands in WUI fires,” Combustion Institute Proceedings, 2022

4.0 WIND SPEED, THERMAL HEAT MOVEMENT, AND SANTA ANA WIND-PRESSURE EFFECTS DURING THE JANUARY 2025 PALISADES FIRE

4.1 About Windspeed thermal Heath Movement, and Santa Ana Wind:

WUI fires in Southern California are frequently governed by extreme wind events. The January 2025 Palisades Fire represents a wind-driven WUI fire in which high wind speeds, elevated thermal heat release, and pressure-gradient-driven airflow collectively controlled fire behavior, ember transport, smoke dispersion, and structural exposure.

Meteorological analyses from the National Weather Service (NWS) indicate that the event occurred during a severe Santa Ana wind episode generated by a strong high-pressure system over the Great Basin and lower pressure along the Southern California coast. This pressure gradient produced powerful downslope winds capable of rapidly accelerating fire spread and transporting heat and embers over long distances^[1].

Observed wind conditions during wildfire events reached extreme levels, with reported gusts approaching or exceeding approximately 90 to 100 miles per hour in portions of Southern California. These near-hurricane-force conditions fall within the upper range of regional wind extremes and are consistent with windstorm-level fire weather events^[1]. High wind velocities directly influenced thermal heat movement. Fire behavior science establishes that wind enhances convective heat transfer by tilting flames, increasing oxygen supply, and accelerating the movement of hot gases and fire plumes.

Under Santa Ana conditions, descending air undergoes adiabatic compression, increasing temperature and reducing relative humidity, thereby preheating fuels and increasing combustion efficiency^[2]. The interaction of wind and heat produced significant wind-pressure effects. Strong pressure gradients associated with Santa Ana winds generated high-velocity airflow and increased dynamic pressure on structures and surrounding fuels. Heated wind conditions forced air into combustion zones, increasing oxygen availability and intensifying burning, while simultaneously driving flames, embers, and combustion byproducts into downwind areas and into buildings.

Scientific analyses characterize Santa Ana wind events as a wind-driven fire regime, in which wind speed, rather than ambient temperature alone, was the dominant factor controlling fire spread and behavior. Under such conditions, fires can grow rapidly, exhibit extreme behavior, and overwhelm suppression efforts due to the combined effects of wind forcing and thermal energy release^[2][3]. Satellite-based atmospheric modeling from the National Aeronautics and Space Administration (NASA) further demonstrates the role of wind in transporting combustion byproducts. Analyses confirm that black carbon and smoke generated during the Palisades Fire were dispersed regionally in accordance with prevailing wind patterns, establishing the direct relationship between wind speed, plume dynamics, and contaminant transport^[4].

California regulatory agencies recognize hazards associated with wind-driven fire environments, where the California Department of Forestry and Fire Protection (Cal/FIRE) and the U.S. Fire Administration (USFA)^[5] identifies wind-driven fire spread and ember cast as primary contributors to structural ignition in WUI fires. Cal/OSHA requires employers to evaluate and control environmental hazards, including wind-driven airborne contaminants and fire conditions, under CCR Title 8 §§5141 (Control of Harmful Exposure to Employees), 3203 (Injury and Illness Prevention Program), and 3380 (Personal Protective Equipment)^[6].

4.2 Thermal Heat and Other Conditions During WUI Fire:

The Palisades Fire demonstrates the combined effects of wind, heat, and pressure in WUI fire environments, including:

• Extreme wind speeds producing sustained windstorm conditions
• Enhanced convective heat transfer through flame tilt and plume acceleration
• Increased oxygen supply driving combustion intensity
•  Pressure-driven airflow forcing heat, smoke, and embers into structures
• Long-range transport of firebrands (embers) ahead of the main fire front
• Regional dispersion of smoke and combustion byproducts These mechanisms collectively define a wind-driven fire regime.

4.3 Summary:

• The January 2025 Palisades Fire was driven by extreme Santa Ana wind conditions produced by strong pressure gradients between inland high-pressure systems and coastal low-pressure regions. 
• Wind gusts approaching 90 to 100 miles per hour created a windstorm environment that controlled fire behavior. These winds enhanced convective heat transfer by tilting flames, increasing oxygen supply, and accelerating thermal plume movement.
• The interaction of high wind speeds and intense heat release generated significant wind-pressure effects, forcing air, heat, embers, and combustion byproducts into downwind areas and into buildings.
• Scientific evidence demonstrates that the Palisades Fire exhibited a wind-driven fire regime characterized by the combined effects of wind speed, thermal heat movement, and pressure-driven airflow, which is consistent with severe WUI fire events.

Technical References:

[1] National Weather Service (NWS) “Meteorological Analysis of January 2025 Santa Ana Wind Event”

[2] Fire behavior and atmospheric science literature on wind-driven fire dynamics and convective heat transfer.

[3] Wildland fire behavior research on wind-dominated fire regimes

[4] National Aeronautics and Space Administration (NASA) “Satellite Analysis of Smoke and Black Carbon Dispersion”

[5] USFA “Protecting Structures from Wildfire Embers and Fire Exposures”

[6] California Code of Regulations, Title 8 §§5141, 3203, 3380 (Cal/OSHA); California Department of Forestry and Fire Protection (CAL FIRE) “WUI Fire Behavior Guidance”

Part 1 through Part 6 Acronyms and Abbreviations Include:

AFD – air filtration device

AIHA – American Industrial Hygiene Association

BSC – Building Science Corporation

Cal/FIRE – California Department of Forestry and Fire Protection Cal/OES – California Office of Emergency Services

Cal/OSHA – California OSHA Cal/EPA – California EPA CBP – combustion byproducts

CCRs – California Code of Regulations

CDC – Center for Disease Control and Prevention CIO2 – chlorine dioxide

CO – carbon monoxide

CO₂ – carbon dioxide

CPSC – U.S. Consumer Product Safety Commission FEMA – Federal Emergency Management Agency FSRT – fire and smoke restoration technician HEPA – high efficiency particulate air

HVAC – heating, ventilation, and air conditioning

IICRC – Institute of Inspection Cleaning and Restoration Certification IH – industrial hygienist

IIPP – Injury and Illness Prevention Program

JHA – job hazard assessment / job hazard analysis

LBP – lead based paint