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Air Quality

Horizontales
Catalyzes formation of ozone
Smallest subatomic particle
Criteria pollutant that is an element
PM is the abbreviation
Closest layer of the atmosphere to Earth
Atoms of the same element with different masses
Time of day when ozone levels are highest
Verticales
Produced when burning coal
Pollutant produced by reaction of other pollutants
Chemical equation that reflects conservation of matter
Good up high, bad nearby
Silent killer
Burning reaction in air
Most abundant element in air
AQI = 36
Unit of concentration for small amounts