AirIndex Today is a free air-quality information service that helps people understand current conditions and plan activities around pollution levels. It provides live AQI information for more than 200,000 cities worldwide, alongside hourly forecasts extending up to five days. Visitors can explore a color-coded global map, browse city readings by continent, and check pollutant concentrations for PM2.5, PM10, nitrogen dioxide, ozone, sulfur dioxide, and carbon monoxide.

The service translates air-quality data into the U.S. EPA AirNow AQI scale and offers health guidance for each category, from Good to Hazardous. Its pollutant information is presented with context from the World Health Organization’s 2021 air quality guidelines, helping users interpret potential health implications and make informed choices about outdoor exercise, commutes, and other activities. Forecasts use Copernicus Atmosphere Monitoring Service data delivered through Open-Meteo; the site notes that modeled estimates may differ from local monitoring-station readings. AirIndex Today requires no account, uses no cookies or tracking, and states that searches remain on the user’s device.