Federal statistics released earlier showed Escambia also is No. 1 in the state and 18th nationally in toxic chemical emissions and seventh nationally in toxic air emissions. The Lung Association's report issued Tuesday is based on ozone measurements in 1997-99.
Ozone can trigger asthma attacks and aggravate bronchitis and emphysema.
Some physicians suspect air and water pollution may contribute to high rates of some cancers, birth defects and other problems in the Pensacola area. Escambia County Commissioner Mike Bass, meanwhile, has proposed a team of industry representatives, health experts, academicians and residents to look for ways to reduce air pollution.