per 1 ppb in model with PM10. Lag 0 () Six cities – Adelaide, Brisbane, Canberra, Melbourne, Perth, Sydney. Age: mean 10.0 years. 270 children with current asthma. Minor morbidity Asthma n/a n/a n/a n/a n/a No CRF exacerbation However, based on No CRF reported, Toxicological Recommended that recommended. evidence but judgement is studies: increase in 500 ug/m3 (0.175 recommends that that 60-140 ug/m3 severity and ppm) not be SO2 not exceed and 140-200 ug/m3 incidence of exceeded (10 0.175 ppm (500 SO2 (annual mean symptoms in minute exposure). ug/m3) (10 of 24-hour mean) asthmatic adults Based on clinical average). associated with with increasing SO2 studies of exercising () increased between 0.2-0.6 asthmatics. respiratory ppm for 5-10 () symptoms in adults minutes. and children Epidemiological respectively. No studies: increased threshold level symptoms in evident. children (especially UK Department of those with asthma Health Advisory or chronic Group, cited in respiratory) at
per 1 ppb in model with PM10. Lag 0 () Six cities – Adelaide, Brisbane, Canberra, Melbourne, Perth, Sydney. Age: mean 10.0 years. 270 children with current asthma. Minor morbidity Asthma exacerbation n/a However, based on evidence recommends that SO2 not exceed 0.175 ppm (500 ug/m3) (10 average). () n/a No CRF reported, but judgement is that 60-140 ug/m3 and 140-200 ug/m3 SO2 (annual mean of 24-hour mean) associated with increased respiratory symptoms in adults and children respectively. No threshold level evident. UK Department of Health Advisory Group, cited in n/a n/a Toxicological studies: increase in severity and incidence of symptoms in asthmatic adults with increasing SO2 between 0.2-0.6 ppm for 5-10 minutes. Epidemiological studies: increased symptoms in children (especially those with asthma or chronic respiratory) at n/a Recommended that 500 ug/m3 (0.175 ppm) not be exceeded (10 minute exposure). Based on clinical studies of exercising asthmatics. () No CRF recommended.