Air Quality Index AQI

Breathe with confidence. Air Quality Index AQI gives you a live, color-coded read on the air around you — a single AQI number you can act on, the pollutant driving it, and straightforward advice on whether to open the windows, wear a mask, or keep the kids inside today. The home screen centers on a gently breathing AQI orb that shifts color with the air quality, from green "good" to deep "hazardous," with a one-line summary and health advice underneath. WHAT YOU GET • Live AQI with health advice — a big, clear index with its category and plain-language guidance on outdoor activity, switchable between US AQI and EU AQI. • Dominant pollutant — instantly see which pollutant is the worst offender right now and how many are above the WHO guideline. • Full pollutant breakdown — current PM2.5, PM10, ozone (O3), nitrogen dioxide (NO2), sulphur dioxide (SO2) and carbon monoxide (CO), each shown against the WHO 2021 guideline limit so you know what's elevated. • Sensitive-group warnings — tailored notes for children, older adults and people with asthma, heart or lung conditions. • Mask & ventilation advice — should you mask up outdoors, and is it a good time to air out the house or keep windows shut? • 24-hour & 5-day trend — see whether the air is improving or worsening, with min/avg/max and a five-day outlook. WHO IT'S FOR People with asthma or other respiratory conditions, parents, runners and cyclists, anyone living near traffic or industry, those in wildfire-smoke regions, and anyone who simply wants to know if today's air is clean. HOW IT WORKS Air-quality data comes from the Open-Meteo air-quality model for your location. Enable location for live local readings, or browse sample data offline. A NOTE ON ACCURACY AQI and pollutant values are modeled forecasts and estimates, not a measurement at your exact spot, and vary with weather and local sources. Comparisons use WHO 2021 guideline levels for reference only. This is not medical advice. Free with ads. No account needed.