Fig 1.
Study flow chart.
Fig 2.
Association between ozone and ERVs/hospital admissions for asthma in the overall analyses.
Fig 3.
Association between carbon monoxide and ERVs/hospital admissions for asthma in the overall analyses.
Fig 4.
Association between nitrogen dioxide and ERVs/hospital admissions for asthma in the overall analyses.
Fig 5.
Association between sulfur dioxide and ERVs/hospital admissions for asthma in the overall analyses.
Fig 6.
Association between PM10 and ERVs/hospital admissions for asthma in the overall analyses.
Fig 7.
Association between PM2.5 and ERVs/hospital admissions for asthma in the overall analyses.
Table 1.
Association of six major air pollutants with ERVs and hospital admissions for asthma in overall and sensitivity analyses.
Fig 8.
Funnel plots for relative risks of ERVs/hospital admissions for asthma in relation to the six air pollutants in lag pattern sensitivity analyses.
A) Funnel plot for ozone; B) Funnel plot for CO; C) Funnel plot for NO2; D) Funnel plot for SO2; E) Funnel plot for PM10; F) Funnel plot for PM2.5.
Table 2.
Stratum-specific combined estimates of the association of six major air pollutants with ERVs and hospital admissions for asthma.