AQI
Air Quality Index - a standardized scale from 0-500 measuring how clean or polluted the air is.
The 8 fields and concepts you'll meet in the response — defined in plain English, each with a real example value.
Air Quality Index - a standardized scale from 0-500 measuring how clean or polluted the air is.
Fine particulate matter smaller than 2.5 micrometers in diameter, small enough to enter the bloodstream.
Coarse particulate matter between 2.5-10 micrometers, including dust and pollen.
Ground-level O3 formed when vehicle and industrial emissions react with sunlight.
Weather condition where warm air traps cold air near the ground, concentrating pollutants.
High Efficiency Particulate Air - filter standard that captures 99.97% of 0.3 micron particles.
Volatile Organic Compounds - gases emitted from paints, cleaning products, and fuels that contribute to ozone formation.
People more vulnerable to air pollution: children, elderly, those with respiratory or heart conditions.