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Maximum Ozone Concentrations & Number of Days Exceeding Standards
By Area within Los Angeles County
1995 - 2000

2000

Year Area No. Days of Data Maximum Concentration in ppm 1-hour Maximum Concentration in ppm 8-hour No. Days Standard Exceeded – Federal >0.12 ppm 1-hr. No. Days Standard Exceeded – Federal >0.08 ppm 8-hr. No. Days Standard Exceeded – State >0.09 ppm 1-hr
2000 Central LA

365

0.14

0.105

1

4

8

2000 Northwest Coastal LA County

365

0.10

0.079

0

0

2

2000 Southwest Coastal LA County

359

0.10

0.075

0

0

1

2000 South Coastal LA County

365

0.12

0.080

0

0

3

2000 West San Fernando Valley

362

0.11

0.084

0

0

6

2000 East San Fernando Valley

363

0.15

0.119

3

11

16

2000 West San Gabriel Valley

362

0.16

0.134

7

14

19

2000 East San Gabriel Valley 1

365

0.17

0.141

11

16

32

2000 East San Gabriel Valley 2

358

0.17

0.148

11

22

39

2000 Pomona/Walnut

363

0.15

0.124

3

5

18

2000 South San Gabriel Valley

365

0.14

0.114

2

4

11

2000 South Central LA County 1

365

0.09

0.064

0

0

0

2000 South Central LA County 2

222*

0.12*

0.095*

0*

4*

4*

2000 Santa Clarita Valley

360

0.13

0.111

1

16

31

1999

Year Area No. Days of Data Maximum Concentration in ppm 1-hour Maximum Concentration in ppm 8-hour No. Days Standard Exceeded – Federal >0.12 ppm 1-hr. No. Days Standard Exceeded – Federal >0.08 ppm 8-hr. No. Days Standard Exceeded – State >0.09 ppm 1-hr
1999 Central LA 362 0.13 0.11 1 2 13
1999 Northwest Coastal LA County 365 0.12 0.08 0 0 4
1999 Southwest Coastal LA County 362 0.15 0.09 1 1 1
1999 South Coastal LA County 362 0.13 0.08 1 0 3
1999 West San Fernando Valley 365 0.1 0.09 0 1 5
1999 East San Fernando Valley 362 0.12 0.1 0 3 13
1999 West San Gabriel Valley 361 0.12 0.1 0 4 15
1999 East San Gabriel Valley 1 339* 0.14* 0.10* 2* 9* 24*
1999 East San Gabriel Valley 2 362 0.14 0.11 3 8 25
1999 Pomona/Walnut Valley 1 358 0.14 0.1 2 10 19
1999 South San Gabriel Valley 363 0.12 0.1 0 2 6
1999 South Central LA County 363 0.12 0.06 0 0 1
1999 South Central LA County 342* 0.16* 0.09* 1* 2* 6*
1999 Santa Clarita Valley 357 0.12 0.1 0 13 18

1998

Year

Area

No. Days of Data

Maximum Concentration in ppm 1-hour

Maximum Concentration in ppm 8-hour

No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.

No. Days Standard Exceeded – Federal >0.08 ppm 8-hr.

No. Days Standard Exceeded – State >0.09 ppm 1-hr

1998

Central LA

362

0.15

0.11

5

9

17

1998

Northwest Coastal LA County

365

0.13

0.08

1

0

7

1998

Southwest Coastal LA County

363

0.09

0.07

0

0

0

1998

South Coastal LA County

361

0.12

0.08

0

0

2

1998

West San Fernando Valley

365

0.16

0.12

7

13

23

1998

East San Fernando Valley

355

0.18

0.13

7

14

34

1998

West San Gabriel Valley

349

0.17

0.14

14

17

31

1998

East San Gabriel Valley 1

352

0.20

0.15

19

23

43

1998

East San Gabriel Valley 2

352

0.22

0.17

28

38

61

1998

Pomona/Walnut Valley 1

365

0.18

0.13

18

21

41

1998

South San Gabriel Valley

364

0.18

0.12

10

13

31

1998

South Central LA County

361

0.09

0.06

0

0

0

1998

South Central LA County

160*

0.13*

0.10*

1*

4*

7*

1998

Santa Clarita Valley

352

0.18

0.15

16

35

38

1997

Year

Area

No. Days of Data

Maximum Concentration in ppm 1-hour

Maximum Concentration in ppm 8-hour

No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.

No. Days Standard Exceeded – Federal >0.08 ppm 8-hr.

No. Days Standard Exceeded – State >0.09 ppm 1-hr

1997

Central LA

365

0.12

0.09

0

3

6

1997

North West Coast LA County

365

0.11

0.09

0

2

6

1997

South West Coast LA County

364

0.11

0.09

0

3

6

1997

South Coast LA County

365

0.10

0.07

0

0

1

1997

West San Fernando Valley

365

0.12

0.10

0

3

12

1997

East San Fernando Valley

355

0.13

0.11

2

6

15

1997

West San Gabriel Valley

365

0.14

0.11

5

16

24

1997

East San Gabriel Valley (1)

357

0.16

0.12

11

18

42

1997

East San Gabriel Valley (2)

365

0.17

0.13

18

26

67

1997

Pomona/Walnut Valley (1)

364

0.16

0.12

7

10

30

1997

Pomona/Walnut Valley (2)

--

--

--

--

--

--

1997

South San Gabriel Valley

355

0.13

0.10

6

7

18

1997

South Central LA County

359

0.08

0.07

0

0

0

1997

Santa Clarita Valley

365

0.16

0.13

13

27

54

1996

Year

Area

No. Days of Data

Maximum Concentration in ppm 1-hour

2nd High Concentration  ppm 1-hour

No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.

No. Days Standard Exceeded – State >0.09 ppm 1-hr

1996

Central LA

366

.14

.14

4

24

1996

North West Coast LA County

357

.14

.12

1

13

1996

South West Coast LA County

366

.13

.12

1

8

1996

South Coast LA County

264*

.11*

.10*

0*

5*

1996

West San Fernando Valley

366

.21

.16

11

50

1996

East San Fernando Valley

366

.14

.14

6

31

1996

West San Gabriel Valley

366

.17

.16

17

54

1996

East San Gabriel Valley 1

366

.20

.18

26

74

1996

East San Gabriel Valley 2

366

.21

.20

49

91

1996

Pomona/Walnut Valley 1

364

.19

.18

16

44

1996

Pomona/Walnut Valley 2

135*

.18*

.14*

2*

7*

1996

South San Gabriel Valley

366

.14

.14

9

32

1996

South Central LA County

360

.10

.09

0

1

1996

Santa Clarita Valley

366

.17

.15

19

68

1996

Antelope Valley

366

.13

.12

1

40

*Less than 12 full months of data. May not be representative

1995

Year

Area

No. Days of Data

Maximum Concentration in ppm 1-hour

2nd High Concentration  ppm 1-hour

No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.

No. Days Standard Exceeded – State >0.09 ppm 1-hr

1995

Central LA

365

.17

.15

5

38

1995

North West Coast LA County

344*

.14*

.12*

1*

19*

1995

South West Coast LA County

365

.12

.10

0

3

1995

South Coast LA County

361

.11

.11

0

3

1995

West San Fernando Valley

365

.15

.14

8

47

1995

East San Fernando Valley

365

.17

.16

20

58

1995

West San Gabriel Valley

362

.21

.19

44

88

1995

East San Gabriel Valley

365

.22

.21

73

118

1995

Pomona/Walnut Valley

365

.22

.20

47

87

1995

South San Gabriel Valley

365

.18

.17

20

66

1995

South Central LA County

363

.09

.08

0

0

1995

Santa Clarita Valley

365

.21

.17

26

72

1995

Antelope Valley 1

360

.14

.14

5

6119

*Less than 12 full months of data. May not be representative

Source: South Coast Air Quality Management District (AQMD)

 

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