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U.S. Counties with the Largest Number of Unhealthy Air Quality Days in 1998 and 2008

Number of UNHEALTHY AIR DAYS in Descending Order, 2008:

County

Number of Days with Air Quality Index Data

Number of Days When Air Quality Was:

Good

Moderate

Unhealthy for Sensitive Groups

Unhealthy

Pinal County, AZ

366

70

112

100

84

San Bernardino County, CA

305

100

87

70

48

Riverside County, CA

366

114

140

75

37

Los Angeles County, CA

250

71

108

43

28

Kern County, CA

278

51

134

67

26

Tulare County, CA

305

110

87

84

24

Hawaii County, HI

305

52

195

42

16

Fresno County, CA

281

80

130

56

15

Kings County, CA

305

89

169

38

9

San Diego County, CA

308

124

151

29

4

Harris County, TX

306

128

157

19

2

Maricopa County, AZ

366

100

233

32

1

Allegheny County, PA

306

119

153

33

1

Douglas County, NE

275

66

206

3

0

Jefferson County, AL

336

118

202

16

0

Number of UNHEALTHY AIR DAYS in Descending Order, 1998:

County

Number of Days with Air Quality Index Data

Number of Days When Air Quality Was:

Good

Moderate

Unhealthy for Sensitive Groups

Unhealthy

San Bernardino County, CA

365

153

91

54

67

Kern County, CA

365

167

76

65

57

Fresno County, CA

365

177

92

49

47

Riverside County, CA

365

179

93

48

45

Los Angeles County, CA

365

148

143

38

36

Sevier County, TN

334

154

103

55

22

Rockdale County, GA

215

97

55

42

21

Douglas County, GA

241

119

71

31

20

Fayette County, GA

215

102

65

30

18

Imperial County, CA

365

113

187

51

14

Dona Ana County, NM

365

157

169

25

14

Jefferson County, TN

213

101

62

37

13

Paulding County, GA

215

103

69

32

11

San Luis Obispo County, CA

365

176

140

42

7

Franklin County, County

215

105

70

33

7

Good - Percent of days in the year when air quality rated "good" on the PSI scale. Calculated as 100 * (days with PSI values 0
through 50) / (total days with PSI values).
Moderate - Percent of days in the year when air quality rated "moderate" on the PSI scale. Calculated as 100 * (days with PSI
values 51 through 100) / (total days with PSI values).
Unhealthful - Percent of days in the year when air quality rated "unhealthful" (or worse) on the PSI scale. Calculated as 100*
(days with PSI values above 100) / (total days with PSI values).

A PSI (Pollutant Standards Index) value is an approximate indicator of overall air quality, because it takes into account all of
the pollutants measured within a county. Many counties have monitoring stations for some, but not all, of the pollutants. PSI
values reflect all of the available measurements in each county.

Source: U.S. Environmental Protection Agency

 

 

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