Ozone (O3) is created through a photochemical reaction between atmospheric oxygen, hydrocarbons and/or carbon monoxide, oxides of nitrogen, and sunlight. At high concentrations at ground level in the lower atmosphere, O3 is an air pollutant that can harm the respiratory systems of people and animals and damage plant tissue. The primary sources of the precursor gases in the Tahoe Basin include on-road motor vehicles, residential fuel combustion, motorized watercraft, off-road equipment, solvent, and fuel evaporation, and off-road recreational vehicles. Ozone can also be transported into the Tahoe Basin from outside sources. Regional programs such as reducing automobile use through transit and bike paths and cleaner-burning wood stoves aim to reduce ozone levels.

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THRESHOLD CATEGORY REPORTING CATEGORY INDICATOR
THRESHOLD CATEGORY REPORTING CATEGORY INDICATOR

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