AQI
Smog severity number
AQI stands for Air Quality Index, a standardized scale measuring pollution levels in outdoor air.
The index typically runs from 0 to 500, with higher numbers indicating worse air quality and greater health risks.
Weather apps and news reports use AQI to advise whether outdoor activity is safe: The AQI hit 150, so we kept the kids inside.
Sunlight-activated urban pollution
- particulatesMinute airborne solids or droplets
- PM2.5Microscopic air pollution particles
- ozoneTriatomic oxygen allotrope
- nitrogen dioxideToxic atmospheric contaminant from combustion
carbon monoxide · sulfur dioxide · emissions · haze · smoke · exhaust · industrial · traffic
Satisfactory in quality
- moderateLessen intensity or preside
- unhealthyHarmful to wellbeing
- hazardousLikely to cause injury
- severeExtremely harsh or strict
color-coded · green · yellow · orange · red · purple · maroon · dangerous
smog
Sunlight-activated urban pollution
- particulatesMinute airborne solids or droplets
- PM2.5Microscopic air pollution particles
- ozoneTriatomic oxygen allotrope
nitrogen dioxide · carbon monoxide · sulfur dioxide · emissions · haze · smoke · exhaust · industrial · traffic · wildfire
good
Satisfactory in quality
severe · color-coded · green · yellow · orange · red · purple · maroon · dangerous · acceptable
index
Alphabetical guide to contents
- readingInterpreting written text
- levelHorizontal or uniform position
- numberSymbol representing quantity
scale · score · value · monitoring · sensor · meter · station · data · forecast · real-time
respiratory
Related to breathing organs
mask · N95 · sensitive · elderly · children · outdoor · advisory · warning · symptoms · irritation
- Weather Scalestemperature scale, heat index, wind chill, UV index, air quality index
- pollution metricsair quality index, particulate matter, PM2.5, carbon monoxide, nitrogen dioxide
- smogsmog, photochemical smog, industrial smog, urban smog, smog alert
- Air RegulationsClean Air Act, emission standards, emission limits, EPA standards, emissions standards
- air pollutionsmog, air pollution, emissions, air pollutants, pollutants
- Danger Levelsdanger, high risk, high-risk, low risk, critical
AQIclean air
Uncontaminated breathable gas
temperature · code red · code green · UV index · pollen count
AQIclean air
Uncontaminated breathable gas
fresh air · pure air · mountain air · unpolluted air · zero emissions