Respiratory effect of longterm exposure to two mixes of air pollutants in Los Angeles County.

THE ENVIRONMENT AND THE LUNG 27S daily symptoms to daily levels of air pollutants, and 2) to act as a surveillance tool for acute respiratory illness (AR!). The ARIs were detected with the aid of the daily diaries and when a child was detected with an AR! he/she was called to the clinic for direct observation. If it was a true AR!, pulmonary function tests were conducted twice during the symptomatic phase and three times during the asymptomatic phase. In general, the symptomatic phase lasted one week and as a general rule the asymptomatic phase was followed-up for two weeks. All of the AM data were adjusted as described above and as such each child served as his own controL Socioeconomic status was characterized between the two schools and there were no differences. Racial distributions were identical between the two schools.