Air Quality Index (AQI) by City
Live air quality, PM2.5 and pollutants for any city with health advice · free, no signup
Live Air Quality Index (AQI) — Pollution Levels for Any City
Search any city, or use your location, to see its air quality right now. You get the US Air Quality Index with a colour and category from Good to Hazardous, a plain-language health message, and the readings for the main pollutants — PM2.5, PM10, nitrogen dioxide, ozone, sulphur dioxide and carbon monoxide — each compared with the World Health Organization's air-quality guideline values.
A 48-hour chart shows how the AQI is expected to change so you can pick the best time to run, cycle or open the windows. Data comes from the Open-Meteo air-quality service, which uses the CAMS atmospheric model; it is a model estimate rather than a reading from a nearby sensor, so treat it as a reliable guide and follow local authority alerts during wildfires or smog episodes.
Key features
US AQI with health advice
Colour-coded category and what to do about it.
Six pollutants vs WHO limits
See which one is driving the pollution.
48-hour forecast
Plan outdoor activity around cleaner hours.
Any city or your location
Worldwide coverage.
How to use it
- Search for a city and choose the right match (or use My location).
- Read the AQI, category and health advice.
- Check which pollutant is highest against its WHO guideline.
- Use the chart to find cleaner hours.
Worked example
Example
Delhi · AQI 168 — Unhealthy · PM2.5 at 480% of the WHO guideline → limit outdoor exertion; sensitive groups stay in.
Who uses this tool
Families and people with asthma
Decide when it is safe to go out.
Runners and cyclists
Pick the cleanest hours.
Travellers and expats
Compare cities before you move.
Tips for the best results
- PM2.5 is the pollutant most linked to health harm.
- Use a well-fitted N95/FFP2 mask on Unhealthy days outdoors.
- Ventilate when the AQI is low, and use a HEPA purifier when it is high.
- Check again after rain, which usually clears the air.
Common mistakes to avoid
- Assuming a clear sky means clean air.
- Exercising hard outdoors when the AQI is above 100.
- Treating model data as an official alert.
Why use AZRS QuickFix?
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Frequently asked questions
What is a good AQI?
0–50 is Good, 51–100 Moderate, 101–150 Unhealthy for sensitive groups, 151–200 Unhealthy, 201–300 Very unhealthy, above 300 Hazardous.
What is PM2.5?
Particles smaller than 2.5 micrometres that can enter the lungs and bloodstream. WHO recommends a 24-hour average below 15 µg/m³.
Where does the data come from?
Open-Meteo's air-quality API, based on the Copernicus CAMS model.
Is it a real sensor reading?
No, it is a model estimate. For hyper-local readings use a nearby monitoring station or an air sensor.
Which AQI scale is used?
The US AQI is shown large, with the European AQI as a small extra.
Is this medical advice?
No. It is general information; talk to a doctor about health conditions.