Ground level ozone, or smog, is formed when volatile organic compounds (VOCs) and nitrous oxides (NOx) react with sunlight. VOCs and NOx are emitted from industrial facilities, electric power plants, automobiles, and chemical solvents. Ozone is known to aggravate asthma and other lung and heart related problems. A new study published in the Journal of the American Medical Association has also found that ozone is a direct cause of death.

The problem is worst in the summer months when high temperatures and sustained sunlight quickly convert VOCs and NOx into ozone. This is particularly dangerous because many Houstonians spend summer.

High ozone levels can affect anyone, but those with respiratory illness, children, and adults who exert themselves outdoors are particularly susceptible to ozone pollution. Ozone has long been suspected of causing respiratory diseases, like asthma, and while that has not been proved, it certainly is known to exacerbate such conditions. Asthmatics often have more severe attacks on days of high ozone. Children’s lungs are still developing and relative to their body size, they inhale twice as much air as adults. Kids also tend to spend more time outside, making them more at risk than adults. Adults who work outdoors such as construction workers or those who exercise outside for prolonged periods are exposed to more outdoor air pollution than others.

Below is a color coded chart that provides an easy guide for evaluating local air quality and protecting your health.

Helpful Links

Air Quality Index (AQI) Report
Air Quality Warnings Status
Map of Current ozone levels
>Current hourly ozone data by site
Ozone Animations>
Ozone forecast information
Monitoring site locations
American Lung Association
Environmental Protection Agency, Air Now