Ground-Level Ozone
A harmful air pollutant formed when emissions from cars, factories, and chemicals react in sunlight. Different from the protective ozone layer high in the atmosphere—at ground level it triggers asthma and lung damage.
Related terms
Criteria Pollutants The six common air pollutants regulated under NAAQS: ground-level ozone, particulate matter, carbon monoxide, lead, sulfur dioxide, and nitrogen dioxide. Asthma Rate The percentage of a population diagnosed with asthma. Frequently used as a public-health indicator of air-pollution exposure, since particulate matter and ozone trigger attacks.