Daily

exposure

Air quality in the urban area of residence

Good

Fair

Poor

Case

No C

∑_row

Case

No C

∑_row

Case

No C

∑_row

1 = Yes

80

381

461

145

642

787

62

210

272

0 = No

13

121

134

26

194

220

24

102

126

∑_column

93

502

595

171

836

1007

86

312

398