LPD was having quite high air pollutant concentration on the days of test in baseline, which might have adversely affected the children’s lung function test results. The air
pollutant profile in the follow-up days, however, followed the usual pattern, with LPD lower than MPD and HPD in that order. Since dpy was assessed from the difference between the lung function obtained in the baseline survey and that in the follow-up visit, it is possible that the dpy of children in LPD was over-estimated owing to the short-term impact of high air pollutant levels on the day of the baseline study.
As the follow-up period was short, it is difficult to distinguish whether the differences in dpy between LPD and the other two districts were due to short-term fluctuations in
air pollutant levels or to longer-term differences in air quality between these districts. A longer follow-up would be necessary to answer this question.
LPD was having quite high air pollutant concentration on the days of test in baseline, which might have adversely affected the children’s lung function test results. The air
pollutant profile in the follow-up days, however, followed the usual pattern, with LPD lower than MPD and HPD in that order. Since dpy was assessed from the difference between the lung function obtained in the baseline survey and that in the follow-up visit, it is possible that the dpy of children in LPD was over-estimated owing to the short-term impact of high air pollutant levels on the day of the baseline study.
As the follow-up period was short, it is difficult to distinguish whether the differences in dpy between LPD and the other two districts were due to short-term fluctuations in
air pollutant levels or to longer-term differences in air quality between these districts. A longer follow-up would be necessary to answer this question.
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