Ozone pollution is formed when volatile organic compounds (VOCs) combine with nitrogen oxides (NOx) in the presence of sunlight. At ground-level, ozone causes breathing problems and respiratory infections in the elderly, the young, and those with pre-existing ailments. Even healthy people who exercise or work outdoors can experience breathing problems when exposed to elevated ozone levels. Ozone causes symptoms due to irritation of the respiratory system, reduction in lung function and aggravation of asthma.
Ozone action alerts are issued by the Colorado Department of Public Health during the summer ozone season based on daily forecasts of conditions that produce higher ozone levels. In addition to the web link above, the State also operates a toll-free telephone hotline to help keep Colorado residents informed about current and predicted air quality conditions. The number is 1-888-484-3247 (1-888-4-THE AIR).
During ozone alert days, people can lower their risk of developing symptoms by limiting prolonged outdoor exercise. The message on any alert will be tailored to the expected ozone level, so that groups at particular risk can be advised. If ozone levels are moderately elevated, unusually sensitive individuals may experience symptoms. Very high ozone levels can cause symptoms for healthy people engaged in even moderate exercise.
During the summer season, and especially during ozone action alerts, people can help out by taking voluntary steps that reduce pollutants that lead to ozone formation. Specific suggestions include: