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. 2020 May 7;17(9):3264. doi: 10.3390/ijerph17093264

Table 2.

Average number of days per year (total and %) and 24-h PM2.5 summary statistics by day type.

Day Type Average Days per Year
(number)
Average Days per Year
(%)
Mean
(μg/m3)
SD
(μg/m3)
Max
(μg/m3)
Unpolluted 95 26% 1.4 0.4 3
LFS 111.8 30.6% 4.2 6.3 313
WHS 158.3 43.4% 7.7 5.4 168

SD = Standard Deviation.