The AQI health risk calculator quantifies your personalised long-term health risk from air pollution exposure — combining your average daily AQI, age, health conditions, years of exposure and daily time outdoors into a single risk score with actionable context. Most AQI tools show you today’s reading without helping you understand what chronic exposure means for your body over months and years. This tool bridges that gap. Get your current local AQI at AQI of My Location to use as your daily average input.

How Long-Term PM2.5 Exposure Affects Health

Short-term AQI readings tell you about today’s risk. Long-term cumulative PM2.5 exposure determines chronic health outcomes. The World Health Organization’s review of thousands of epidemiological studies establishes that every 10 µg/m³ increase in annual average PM2.5 exposure is associated with approximately 6–13% increased risk of cardiovascular mortality, 4–8% increased risk of lung cancer and measurable reductions in life expectancy. Cities like Kanpur, Patna, Ghaziabad and Delhi with annual average PM2.5 above 80 µg/m³ — sixteen times the WHO guideline — represent some of the highest chronic health burdens from air pollution measured anywhere in the world.

Importantly, health impacts are not threshold effects that only appear at extreme concentrations. Every unit of PM2.5 exposure contributes to cumulative risk, even at levels below national standards. This is why the WHO revised its 2021 guideline to 5 µg/m³ annual average — well below both Indian (40 µg/m³) and US EPA (9 µg/m³) standards. Compare your city’s AQI against others using the AQI comparison tool.

Frequently Asked Questions

How does air pollution affect long-term health?

Chronic PM2.5 exposure is associated with increased risk of cardiovascular disease, stroke, lung cancer, COPD, type 2 diabetes and cognitive decline. The WHO estimates that outdoor air pollution contributes to approximately 4.2 million premature deaths globally per year. Household air pollution from indoor cooking fires contributes another 3.2 million. Every 10 µg/m³ increase in annual average PM2.5 is associated with 6–13% increased cardiovascular mortality risk in long-term population studies.

What is the equivalent of living in a polluted city in cigarettes?

A commonly used approximation is that every 22 µg/m³ of PM2.5 concentration is roughly equivalent to one cigarette per day in terms of PM2.5 mass delivered to the lungs. At Delhi’s winter average of 150 µg/m³, outdoor exposure alone is equivalent to approximately 7 cigarettes per day. However, cigarette smoke contains specific carcinogens (benzene, formaldehyde, acrolein) not present at the same levels in outdoor PM2.5, so the comparison captures particle dose but not all chemical hazards. Use our AQI cigarette calculator for your specific AQI level.

Can you recover from long-term air pollution exposure?

Partially. Studies of populations that moved from high-pollution to low-pollution areas show measurable improvement in cardiovascular markers, lung function and mortality risk over time — particularly within the first five to ten years. Children’s lungs show the most recovery potential. However, established lung tissue damage — such as early-stage COPD or fibrosis — does not fully reverse. This is why early exposure reduction through purifiers, masks and outdoor time management is more valuable than later intervention.

Are children more affected by air pollution than adults?

Yes, significantly more. Children’s lungs are still developing until approximately age 18. PM2.5 exposure during childhood directly impairs lung development, resulting in permanently reduced lung function that persists into adulthood even if the child later moves to a clean-air environment. Additionally, children breathe more air per unit of body weight than adults and spend more time in activities that increase ventilation rate. The WHO and UNICEF have designated childhood air pollution exposure as one of the most urgent global health crises affecting children.

Does an air purifier protect against long-term health effects of pollution?

Yes, meaningfully so. Studies of HEPA air purifier use in randomised controlled trials show reductions in cardiovascular inflammation markers (CRP, IL-6, fibrinogen) within weeks of purifier installation in high-pollution environments. A 75–90% reduction in indoor PM2.5 from a properly sized HEPA purifier represents a major reduction in cumulative annual dose for people who spend significant time indoors — which is most people. The indoor dose reduction is the most actionable health intervention available to most households short of relocation.