Change in forced No effect of 1-hour n/a n/a n/a. n/a No CRF expiratory volume in maximum or 3-8% decrements Toxicological However, cited recommended. 1 second (FEV1; average. in FEV1 in children studies: Reduction chamber studies litres) () are associated with in FEV1 and that showed No effect in (≥15%) Six cities ambient annual SO2 increased airway changes in lung Australian 6-cities – Adelaide, Brisbane, and SO4 resistance function at levels study (). (≥100%) Canberra, concentrations >100 in 5-30% of >500 ug/m3 after 10 Melbourne, Perth, ug/m3. exercising minutes leading to Sydney. () asthmatics at air quality guidelines Age: mean 10.0 () ppm and of 500 ug/m3 years. at 0.4-1.0 ppm minute average). 270 children with (5-10 minutes () current asthma. exposure). Epidemiological No CRF, but set studies: inconsistent guideline of 125 for lung function ug/m3 (0.04 ppm) effects in children (24-hour average) and adults. and 50 ug/m3 () (annual average). () Change in peak 1-hour maximum n/a n/a n/a n/a No CRF expiratory flow rate No effect. recommended. (PEF; litres per minute) 24-hour average SO2 shows a Morning PEF: positive effect on 1.2686 lung function in per 1 ppb. Australian 6-cities Lag 2 study (). Morning PEF: No effect in model with PM10. Evening PEF: 1.6946
Change in forced expiratory volume in 1 second (FEV1; litres) No effect of 1-hour maximum or average. () Six cities – Adelaide, Brisbane, Canberra, Melbourne, Perth, Sydney. Age: mean 10.0 years. 270 children with current asthma. n/a 3-8% decrements in FEV1 in children are associated with ambient annual SO2 and SO4 concentrations >100 ug/m3. () () n/a n/a. Toxicological studies: Reduction in FEV1 (≥15%) and increased airway resistance (≥100%) in 5-30% of exercising asthmatics at ppm and at 0.4-1.0 ppm (5-10 minutes exposure). Epidemiological studies: inconsistent for lung function effects in children and adults. () n/a However, cited chamber studies that showed changes in lung function at levels >500 ug/m3 after 10 minutes leading to air quality guidelines of 500 ug/m3 average). () No CRF, but set guideline of 125 ug/m3 (0.04 ppm) (24-hour average) and 50 ug/m3 (annual average). () No CRF recommended. No effect in Australian 6-cities study (). Change in peak expiratory flow rate (PEF; litres per minute) 1-hour maximum No effect. 24-hour average Morning PEF: 1.2686 per 1 ppb. Lag 2 Morning PEF: No effect in model with PM10. Evening PEF: 1.6946 n/a n/a n/a n/a No CRF recommended. SO2 shows a positive effect on lung function in Australian 6-cities study (). minute