Know What's in the Air You Breathe
Current AQI, hourly forecast, pollutant levels, and health advice — free, private, no sign-up needed.
Understanding the Air Quality Index
Source: US EPA AirNow, EPA-454/B-24-002
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Live world map
Air quality right now across the whole world, colored by the US air quality index. Move the slider under the map to see the hours ahead, or switch to a single pollutant.
Highest right now
from 200k+ cities
Modeled forecast data. AQI values come from atmospheric models (CAMS via Open-Meteo), not local monitoring stations. Readings can differ from ground-level conditions — for exact street-level values, consult an official air quality station near you.
Built Around Air Quality
6 Pollutants, One Score
PM₂.₅, PM₁₀, NO₂, O₃, SO₂, and CO — shown with current concentrations and WHO 2021 guideline context. AQI is calculated separately using the U.S. EPA AirNow standard.
5-Day Hourly Forecast
CAMS atmospheric models give hour-by-hour AQI predictions 5 days ahead. Plan outdoor runs, school trips, or morning commutes around the air quality.
No Account, No Tracking
No cookies, no email, no personal data stored. Your searches stay on your device. Air quality data is everyone's right — not a premium feature.
CAMS Data & EPA AQI
Data comes from the Copernicus Atmosphere Monitoring Service (CAMS) via Open-Meteo. AQI follows the U.S. EPA AirNow standard; pollutant cards are compared with WHO 2021 air quality guidelines.
Understanding the Air Quality Index
The AQI is a standardized index developed by the U.S. EPA to communicate how clean or polluted the air is. It runs from 0 to 500 and is divided into six color-coded categories.
Source: US EPA AirNow, EPA-454/B-24-002
Why Check the AQI Daily?
Air pollution causes respiratory issues, aggravates asthma and allergies, and increases the risk of cardiovascular problems. Fine particles (PM2.5) can penetrate deep into the lungs and bloodstream. The World Health Organization estimates that air pollution causes millions of premature deaths worldwide each year. Checking the AQI before outdoor activities helps you make informed decisions — especially if you're in a sensitive group.
How is the AQI Calculated?
The AQI is derived from concentrations of major pollutants: ground-level ozone (O₃), fine particles (PM2.5 and PM10), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO). Each pollutant gets its own AQI value, and the highest determines the overall index. Forecast pollutant concentrations come from CAMS via Open-Meteo.
Browse by continent
Explore the current air quality index for major cities around the world. Click any city for a detailed hourly AQI forecast and health advice.
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About Air Index Today
Air Index Today provides free real-time air quality forecasts worldwide. AQI data comes from the Copernicus Atmosphere Monitoring Service (CAMS) via Open-Meteo. We follow the U.S. EPA AQI standard with health guidance from EPA AirNow, while pollutant levels are compared against WHO 2021 Air Quality Guidelines.
