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Understanding air pollution and health
Audience: patients-public, students-learners ยท Review state: published
What it is
Air pollution is a mix of harmful particles and gases in the air we breathe. The most damaging are fine particles called PM2.5, small enough to pass deep into the lungs and into the bloodstream, plus gases such as ozone, nitrogen dioxide, and sulfur dioxide.
Major sources include traffic, industry, power generation, burning of solid fuels for cooking and heating, wildfires, and dust. Household smoke from cooking fires is one of the largest sources worldwide.
How it harms health
Breathing polluted air irritates the airways and triggers inflammation throughout the body. Short-term exposure worsens asthma and can trigger heart attacks and strokes in vulnerable people. Long-term exposure is linked to chronic lung disease, heart disease, stroke, lung cancer, and worse outcomes for children's lung development.
Air pollution is one of the largest environmental causes of disease worldwide, and the burden falls hardest on children, older adults, and people with existing heart or lung conditions.
Who is most at risk
Children breathe more air relative to their size and their lungs are still developing. Older adults, pregnant women, outdoor workers, and people with asthma, COPD, diabetes, or heart disease face higher risk from the same exposure.
People living near busy roads, industry, or relying on solid-fuel cooking carry the heaviest exposure.
Reducing exposure
On high-pollution days, checking local air quality forecasts and moving exercise indoors or away from traffic helps. At home, avoiding indoor smoking, ventilating while cooking, and using clean cooking fuels make a real difference.
At the community level, cleaner transport, industry controls, and clean household energy are the measures that move population health. Symptomatic people - new or worsening cough, wheeze, or chest discomfort - should discuss exposure with a clinician.
Limitations
General educational overview, not medical advice. Personal risk depends on local air quality and individual health conditions.