Smoke Restore resource library
Official guidance and primary research on wildfire smoke, ash, and health.
Use original public-health sources to understand smoke exposure and recovery after a fire. This library brings together guidance from the U.S. Environmental Protection Agency (EPA), the Centers for Disease Control and Prevention (CDC), and CDC’s National Institute for Occupational Safety and Health (NIOSH), alongside published investigations. Every resource links to its original government source.
EPA identifies fine particle pollution as a major health concern in wildfire smoke. CDC lists coughing, wheezing, trouble breathing, eye irritation, headache, chest pain, and a fast heartbeat among possible immediate effects. Most healthy people recover quickly, but some people face greater risks.
EPA: Wildfire Smoke and Health · CDC: How Wildfire Smoke Affects Your Body
EPA warns that settled ash can be inhaled when it becomes airborne. Ash from burned buildings generally contains more harmful chemicals than forest ash. Cleanup guidance addresses this exposure pathway separately from breathing an active smoke plume.
EPA: Protect Yourself from Ash · CDC: Safety Guidelines After a Wildfire
CDC provides specific guidance for children, pregnancy, and chronic conditions. Children should not participate in cleanup. People with ongoing health conditions should plan with their healthcare provider, follow their treatment or asthma action plan, and seek care for symptoms that persist or worsen.
EPA identifies cancer-causing chemicals among possible post-fire hazards. Its review also describes early studies linking cumulative smoke exposure over multiple years with cancer. EPA emphasizes that longer-duration evidence is limited and exposure patterns are difficult to measure. These findings do not establish the cancer risk of a particular home or a single smoke event.
EPA: Protect Yourself from Ash · EPA: Durations of Smoke Exposure
Browse 28 articles, guidance pages, and research reports by topic. Summaries are written by Smoke Restore. Agency labels identify the original publisher; study summaries describe the population, setting, and limits of the findings.
Start here to understand the health evidence, who is more vulnerable, and where scientific uncertainty remains.
EPA · Start here
Guidance
An approachable overview of symptoms and more serious respiratory and cardiovascular effects. EPA explains how the amount and duration of exposure matter, identifies higher-risk groups, and recommends ways to reduce exposure.
Useful for: A clear first read for homeowners and families.
Read the original EPA publicationEPA · Particle pollution
Guidance
Explains why small airborne particles can affect the lungs and heart. EPA summarizes links with asthma aggravation, reduced lung function, irregular heartbeat, heart attacks, and other serious outcomes. This is general particle-pollution evidence, not a test of any individual property.
Useful for: Understanding why reducing inhaled particles matters.
Read the original EPA publicationEPA · Scientific evidence
Guidance
A deeper review from EPA’s health-professional course. It explains the evidence for short-term wildfire smoke effects, including respiratory illness and emergency visits, and distinguishes the stronger respiratory evidence from the smaller body of cardiovascular studies.
Useful for: Readers who want research context behind the health guidance.
Read the original EPA publicationEPA · Higher-risk groups
Guidance
Explains why children, older adults, pregnant people, and people with existing heart or lung conditions may need extra precautions. It also addresses people whose work or living conditions increase their exposure.
Useful for: Planning precautions around a household’s health needs.
Read the original EPA publicationEPA · What smoke contains
Guidance
Describes the particles, gases, and organic compounds in wildfire smoke, including carbon monoxide, volatile organic compounds, and polycyclic aromatic hydrocarbons. EPA explains why fine particles receive particular attention and why other pollutants can also matter.
Useful for: A source-based explanation of smoke’s chemical complexity.
Read the original EPA publicationEPA · Longer-term evidence
Guidance
Examines repeated and longer-duration exposures, including early studies reporting cancer and mortality associations over multiple years. EPA highlights important limits in the evidence and cautions against treating wildfire exposure as constant over time.
Useful for: Understanding what is known and still being studied about lasting effects.
Read the original EPA publicationCDC turns public-health evidence into practical guidance for symptoms, individual health needs, and family preparation.
CDC · Symptoms and risk
Public health guidance
CDC explains the symptoms that can occur immediately after breathing wildfire smoke, from eye and throat irritation to breathing difficulty and chest symptoms. It identifies children, pregnant people, responders, and people with certain chronic conditions as higher-risk groups.
Useful for: Recognizing smoke-related symptoms and understanding who may need extra care.
Read the original CDC publicationCDC · Family guidance
Public health guidance
Guidance for medicines, school and air-quality updates, cleaner indoor air, and planning with a child’s clinician. CDC says children should not do cleanup work and should stay away from ash. Respirator fit is a particular limitation for young children.
Useful for: Planning around children’s health before and after a smoke event.
Read the original CDC publicationCDC · Pregnancy
Public health guidance
CDC recommends extra precautions during pregnancy, including planning for prenatal care and delivery if evacuation disrupts access. It covers reducing smoke and heat exposure, continuing care, following local reentry guidance, and avoiding direct ash contact.
Useful for: Making a pregnancy-specific smoke and evacuation plan with a healthcare provider.
Read the original CDC publicationCDC · Personal health planning
Public health guidance
Advice for people with asthma, COPD, heart disease, diabetes, and other chronic conditions. CDC emphasizes preparing medicines, following existing care plans, limiting exposure, and contacting a clinician when symptoms do not go away. Severe breathing difficulty or chest pain can require emergency care.
Useful for: Knowing what to discuss with a clinician and when to seek help.
Read the original CDC publicationThese resources focus on cleanup and damaged buildings. They do not provide a contamination diagnosis for your home.
EPA · Essential cleanup reading
Guidance
EPA’s practical guidance on avoiding ash exposure, preventing dust from becoming airborne, and protecting people during cleanup. It covers potentially hazardous fire debris and recommends considering professional help when structural damage, hazardous materials, HVAC impacts, or the scale of cleanup make it necessary.
Useful for: Preparing to return to an ash-affected property.
Read the original EPA publicationEPA · Before, during, and after
Guidance
Connects wildfire conditions with the air inside a home. EPA covers indoor smoke reduction, cleaner-air spaces, and precautions for ash cleanup after the smoke clears, including avoiding activities that stir settled particles back into the air.
Useful for: Following the full sequence from smoke event to recovery.
Read the original EPA publicationEPA · Additional hazards
Guidance
Broader disaster guidance on damaged materials, leaking chemicals, carbon monoxide, asbestos, and lead dust. It emphasizes following local orders and using caution around suspect materials rather than disturbing them without appropriate help.
Useful for: Properties with building damage or potentially hazardous debris.
Read the original EPA publicationThe household pages and worker guidance have different scopes. Use occupational resources to understand hazards and ask qualified professionals informed questions, not as a do-it-yourself hazardous-materials procedure.
CDC · During a smoke event
Public health guidance
Practical guidance on local alerts, air quality, indoor air, and correctly fitted respirators. CDC emphasizes following emergency-management instructions and reducing exposure, especially for people with health conditions. Shelter-in-place advice never overrides an evacuation order.
Useful for: A reliable checklist while conditions are changing.
Read the original CDC publicationCDC · Returning home
Public health guidance
CDC advises returning only when authorities say it is safe and continuing to check air quality because smoke can remain for days after a fire ends. It covers ash protection, health symptoms, and other recovery concerns such as potentially contaminated private wells.
Useful for: Preparing for reentry without assuming the end of flames means the end of exposure.
Read the original CDC publicationCDC/NIOSH · Worker safety
Occupational guidance
A detailed worker-safety resource on unstable structures, electrical hazards, ash, hazardous materials, and other cleanup risks. NIOSH explains why professional cleanup may be more appropriate and recommends identifying hazardous materials before work begins. Its scope is cleanup workers, not active firefighting.
Useful for: Understanding why damaged structures and suspect debris need qualified help.
Read the original CDC/NIOSH publicationCDC/NIOSH · Exposure controls and respirators
Science bulletin · 2025
Explains work scheduling, cleaner-air breaks, and properly fitted NIOSH-approved respirators. It distinguishes particle-filtering respirators from loose-fitting masks and discusses employers’ respiratory-protection responsibilities, including training and appropriate programs when protection is required at work.
Useful for: Understanding respirator limits and the difference between personal and workplace protection.
Read the original CDC/NIOSH publicationUse these resources while smoke is in the air, following local emergency guidance and taking heat and safe evacuation into account.
EPA · Everyday precautions
Guidance
A practical checklist covering air-quality updates, indoor filtration, outdoor activity, vehicle settings, and avoiding extra indoor pollution. EPA also explains when to air out a home and when to seek a cooler, cleaner place.
Useful for: Building a household plan for smoky days.
Read the original EPA publicationEPA · Choosing filtration
Guidance
Compares compatible high-efficiency HVAC filters, portable air cleaners, and DIY air cleaners. EPA explains sizing and maintenance and favors mechanical filtration for smoke particles. It cautions that some electronic or chemical air-cleaning technologies may add pollutants.
Useful for: Comparing filtration options without relying on marketing claims.
Read the original EPA publicationEPA · Room-by-room protection
Guidance
Step-by-step guidance for a room with less smoke, including limiting outdoor smoke entry, filtering the air, staying cool, and reducing indoor pollution sources. A cleaner-air room is an option only when it is safe to remain at home.
Useful for: Making one room a better place to spend time during smoke events.
Read the original EPA publicationEPA · Respirator guidance
Guidance
Explains how properly fitting NIOSH-approved N95 or P100 respirators can reduce inhaled smoke and ash particles. EPA covers fit, use, and precautions for people with health conditions. A respirator does not replace evacuation or other exposure-reduction steps.
Useful for: Learning the limits and correct use of particle-filtering respirators.
Read the original EPA publicationEPA’s guidance can help you ask better questions about equipment, methods, and claims before work begins.
EPA · What filtration can do
Guidance
Explains that filtration supplements pollution-source control and ventilation with clean outdoor air. Portable cleaners and HVAC filters can reduce indoor pollution, but they cannot remove every pollutant. Links include both a consumer guide and a technical summary.
Useful for: Setting realistic expectations for air-cleaning equipment.
Read the original EPA publicationEPA · Check treatment claims
Guidance
EPA explains ozone’s health risks and why ozone is generally ineffective at controlling indoor pollution at concentrations within public-health standards. It also makes clear that an EPA establishment number is not an endorsement or proof that a device is safe or effective.
Useful for: Evaluating ozone-based air-cleaning and odor-treatment claims.
Read the original EPA publicationEPA · Avoid blanket assumptions
Guidance
EPA recommends duct cleaning when needed rather than routinely. The article describes conditions that may justify it, questions to ask a contractor, and the limits of claims that duct cleaning prevents health problems.
Useful for: Discussing evidence of HVAC contamination before choosing work.
Read the original EPA publicationThese reports document specific events and workplaces. MMWR is CDC’s Morbidity and Mortality Weekly Report. Results describe the settings studied and should not be converted into a contamination finding, cancer prediction, or safety clearance for another property.
CDC/MMWR · Population health study
Research report · 2023
CDC’s surveillance analysis found asthma-related emergency visits were 17% above expected levels across the 19 identified smoke days in the study period. The report supports the importance of exposure reduction, while its observational, regional data do not predict any individual person’s outcome.
Useful for: Seeing documented health effects during a large smoke episode.
Read the original CDC/MMWR publicationCDC/MMWR · Urban-fire pollution
Environmental investigation · 2025
This report documented a sharp increase in airborne particle-bound lead at a monitoring site during the Los Angeles fires. It illustrates why burning buildings can change smoke composition. The measurements concern outdoor air at that site, not residue levels inside a particular home.
Useful for: Understanding why forest fires that enter neighborhoods need careful assessment.
Read the original CDC/MMWR publicationCDC/MMWR · Read the results in context
Surveillance report · 2025
Wildfire-associated visits made up a larger share of emergency care during this event, while overall visits initially declined. The study did not find an increase in the average share of cardiorespiratory visits. It shows why health findings vary with timing, measures, population, and conditions.
Useful for: Understanding why one study does not describe every wildfire’s impact.
Read the original CDC/MMWR publicationCDC/NIOSH · Measured cleanup exposures
Health Hazard Evaluation · 2019
A NIOSH investigation of 2018 cleanup work identified silica exposure concerns and metals on workers’ hands. Measured airborne asbestos, metals, and PAHs were below occupational exposure limits. The report documents work practices and controls, not a universal contamination profile or residential safety standard.
Useful for: Reading a real exposure investigation with both findings and limits.
Read the original CDC/NIOSH publicationEPA’s wildfire fact-sheet collection includes smoke and health, ash cleanup, at-risk groups, children’s health, filtration, and other topics. Many are available in English and Spanish.
These resources support informed decisions, but they do not establish which contaminants are present in a particular building or whether it is safe to occupy. If your home has been affected by smoke or ash, discuss the observed conditions, the scope of any assessment, and the reasons for proposed cleanup steps with a qualified professional.
