Table 2.

Annual average concentration of environmental variables during the study period.

Environmental Variable	Mean ± SD	Range	IQR
PM10 (μg/m3)	44.4 ± 14.4	20.5–125.3	15.3
O3 (ppb)	30.2 ± 5.1	14.1–41.2	7.0
NO2 (ppb)	19.4 ± 4.1	12.3–39.2	4.4
SO2 (ppb)	5.7 ± 3.2	1.2–15.8	4.2
CO (ppm)	0.72 ± 0.2	0.24–1.7	0.2
Temperature ($\ast C$)	29.0 ± 0.3	28.4–29.3	0.4
Relative humidity (%)	72.7 ± 2.0	69.5–75.7	3.1