# Reduce exposure to polluted air

Published by Pawel Jozefiak. [About this project](https://healthy100.jock.pl/about/), [How we check sources](https://healthy100.jock.pl/methodology/)

- Canonical: https://healthy100.jock.pl/reduce-air-pollution-exposure/
- Language: en
- First published: 2026-09-27
- Evidence checked: 2026-09-28, using AI-assisted source verification
- Clinical review: Not clinically reviewed
- Number 25 of 100 in the list: https://healthy100.jock.pl/#reduce-air-pollution-exposure

Checking air quality and filtering smoky indoor air can reduce the particles you breathe.

**The number:** WHO estimated 4.2 million premature deaths from outdoor air pollution in 2019 ([WHO, 2024](https://www.who.int/news-room/fact-sheets/detail/ambient-%28outdoor%29-air-quality-and-health))

## The evidence

- Evidence grade: B. Grade B: consistent large cohort studies, with some trial evidence.
- Basis: WHO population health evidence and EPA exposure reduction guidance; personal intervention outcome evidence is more limited
- Impact: 73/100. The impact score is an editorial prioritization heuristic for the general list, not a validated estimate of your personal risk.

## Why it matters

Fine particles can reach deep into the lungs and contribute to heart disease, stroke and lung disease. WHO estimated 4.2 million premature deaths worldwide from outdoor air pollution in 2019. That is a population burden estimate, not the number of deaths an air cleaner can prevent; cleaner air also requires wider policy changes.

## How to do it

1. Check your local air quality alerts, particularly during smoke events.
2. When smoke makes outdoor air unhealthy, follow public health advice and spend time in a cleaner indoor space.
3. Use a portable air cleaner sized for the room that does not generate ozone, and run it consistently.
4. Keep smoke out when outdoor air is poor, reduce indoor particle sources such as candles, and ventilate when outdoor air improves.
5. During wildfire smoke, use a suitable HVAC filter if the system supports it and follow evacuation advice.

## Talk to a clinician first

Ask for a smoke action plan if you have heart or lung disease. Do not keep a home dangerously hot to exclude smoke; move to a cooled space with cleaner air when needed.

## Putting it into practice

### Start now

- 1 minute: Look up today's air quality index for where you live, and check the advice for your group if it is poor.
- 5 minutes: If there is an alert or smoke, follow its advice and pick a cleaner indoor place you could use, one you can also keep cool.
- 15 minutes: Read the EPA room guide and choose a room your household can share; check cooling, smoke entry points and indoor particle sources.
- 30 minutes: Make a smoke plan: choose your room, check cleaner instructions and arrange a cooler backup location.

### What it looks like

- During wildfire smoke, use a room with a suitable air cleaner and keep its doors and windows closed if you can stay cool.
- Skip candles and incense when you are trying to keep indoor air cleaner.

### Common mistakes

- Closing windows can overheat your home, so move to a cooler place with cleaner air if needed.
- An ozone generator can worsen air quality, so choose an air cleaner that does not generate ozone.

### A structured start

**Prepare for a smoke day**

1. Before smoke arrives, choose a room and a backup cooled location with cleaner air.
2. If using an air cleaner, check room size, ozone information and the filter instructions.
3. During smoke, follow alerts, reduce indoor smoke sources and run the cleaner continuously as instructed.
4. Air out the room when outdoor air improves and follow evacuation instructions when issued.

### Trusted how-to guides

- [Create a Clean Room During a Wildfire](https://www.epa.gov/emergencies-iaq/create-clean-room-protect-indoor-air-quality-during-wildfire), US EPA
- [European Air Quality Index](https://airindex.eea.europa.eu/AQI/index.html), European Environment Agency

## Sources

- [Ambient outdoor air pollution](https://www.who.int/news-room/fact-sheets/detail/ambient-%28outdoor%29-air-quality-and-health), WHO, 2024 (Tier 1 guideline)
- [Create a Clean Room to Protect Indoor Air Quality During a Wildfire](https://www.epa.gov/emergencies-iaq/create-clean-room-protect-indoor-air-quality-during-wildfire), US EPA, 2026 (Tier 1 guideline)

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General health information, not a diagnosis or an individual treatment plan. Personalization changes the order of suggestions; it does not assess your medical risks. Follow the cautions and consult a qualified clinician when needed.

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