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Ammonia (NH3) Nitrogen dioxide (NO2) Nitric oxide (NO)
Nitrogen dioxide (NO2) Ozone (O3) Particulate matter (PM) Sulphur dioxide (SO2) Volatile organic compounds (VOC) Formaldehyde (methanal, HcHo, CH2O, )
It gets more complicated. Some gases can react with other compounds to for particulate matter.
Sulphur dioxide is an irritant, and can cause respiratory diseases in humans and animals. It forms acid rain when dissolved in water.
nitrogen dioxide (NO2) to form ground-level ozone (O3), and contribute to creating secondary particulate matter (PM2.5).
Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. VOCs are released from gasoline, paints, and many cleaning solvents. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.
Formaldehyde is a colorless chemical which easily becomes a gas at room temperature, which makes it VOC, but is soluble in water to make it a liquid CH2(OH)2.
Acetone comes as a liquid for things such as nail polish remover but is exempt from restrictions placed on most volatile organic compounds (VOCs).
Links - Sources:
AQI today and tomorrow for your location | EPA AirNow.gov
Air Quality 101 | North Carolina Department of Environmental Quality
The National Ambient Air Quality Standards for Particle Pollution
REVISED AIR QUALITY STANDARDS FOR PARTICLE POLLUTION AND UPDATES TO
THE AIR QUALITY INDEX (AQI) | EPA