Ozone is a severe irritant, responsible for choking coughing and stinging eyes associated with smog.
Ozone damages lung tissue, aggravates respiratory disease, and makes people more susceptible to respiratory infections. Peak concentration of ozone typically occur in summer. Particulate matter is the term used for a mixture of solid particles and liquid droplets found in the air. These particles come in a wide range of sizes and can remain suspended in the air for extended periods. Particulate matter irritates the membranes of the respiratory system, causing increased respiratory symptoms and disease decreased lung function, alterations of the body's defense systems, and premature mortality.