GOOD No health precautions need to be taken. These individuals may need to limit prolonged outdoor activities and avoid moderate to heavy exercise. Active children and adults and people with respiratory disease should limit prolonged, moderate exertion outdoors. Individuals without respiratory problems may experience mild symptoms of lung irritation and may need to limit strenuous or prolonged outdoor activities. Individuals with respiratory disease should limit all outdoor activities and move indoors to an air conditioned area if breathing becomes difficult.
Ozone is a colorless gas that can be found throughout the earth's atmosphere.
In the upper atmosphere, ozone exists naturally where it shields the earth from the sun's ultraviolet rays. The primary sources of VOCs and nitrogen oxides are automobile and industrial emissions. These compounds react with oxygen in the air in the presence of heat and strong sunlight to produce ground-level ozone, the primary ingredient of smog. Besides being a hazard to human health, ozone is damaging to forests and vegetation and can cause degradation of materials such as rubber and paint. Keep your automobile well tuned and maintained.