2024-17573. Finding of Failure To Attain the 1997 8-Hour Ozone Standards; California; Los Angeles-South Coast Air Basin

Table 1—South Coast Ozone Nonattainment Area Fourth High 8-Hour Ozone Average Concentrations and Design Values ( ppm ) for 2021-2023

General location	Site name (AQS ID)	4th Highest daily maximum			Design value (2021-2023)
		2021	2022	2023
Los Angeles County:
East San Gabriel Valley	Azusa (06-037-0002)	0.077	a  N/A	a  N/A	b  Invalid
East San Gabriel Valley	Glendora (06-037-0016)	0.090	0.094	0.102	0.095
Northwest Coastal LA County	West Los Angeles (06-037-0113)	0.059	0.058	0.064	0.060
Central Los Angeles	Los Angeles—North Main Street (06-037-1103)	0.068	0.073	0.075	0.072
West San Fernando Valley	Reseda (06-037-1201)	0.080	0.078	0.087	0.081
( print page 66294)
South Central Los Angeles County	Compton (06-037-1302)	0.062	0.064	0.068	0.081
South San Gabriel Valley	Pico Rivera #2 (06-037-1602)	0.068	0.070	0.075	0.071
Pomona/Walnut Valley	Pomona (06-037-1701)	0.089	0.088	0.095	0.090
West San Gabriel Valley	Pasadena (06-037-2005)	0.081	0.081	0.086	0.082
South Coastal LA County	Signal Hill (06-037-4009)	0.060	0.058	0.062	0.060
East San Fernando Valley	North Hollywood (06-037-4010)	0.079	0.082	0.085	0.082
Southwest Coastal LA County	LAX Hastings (06-037-5005)	a  N/A	a  N/A	a  N/A	b  Invalid
Santa Clarita Valley	Santa Clarita (06-037-6012)	0.097	0.095	0.103	0.098
Orange County:
Central Orange County	Anaheim (06-059-0007)	0.063	0.060	0.064	0.062
Saddleback Valley	Mission Viejo (06-059-2022)	0.078	a  N/A	a  N/A	b  Invalid
North Orange County	La Habra (06-059-5001)	0.070	0.070	0.077	0.072
Riverside County:
Banning	Banning Airport (06-065-0012)	0.102	0.093	0.095	0.096
Temecula Valley	Temecula (06-065-0016)	0.078	0.070	0.069	0.072
Perris Valley	Perris (06-065-6001)	0.091	a  N/A	a  N/A	b  Invalid
Metropolitan Riverside County	Rubidoux (06-065-8001)	0.091	0.092	0.097	0.093
Mira Loma	Mira Loma (Van Buren) (06-065-8005)	0.093	0.087	0.095	0.091
Lake Elsinore	Lake Elsinore (06-065-9001)	0.090	0.086	0.086	0.087
San Bernardino County:
Central San Bernardino Mountains	Crestline (06-071-0005)	0.107	0.105	0.106	0.106
Northwest San Bernardino Valley	Upland (06-071-1004)	0.097	0.098	a  N/A	b  Invalid
Central San Bernardino Valley	Fontana (06-071-2002)	0.099	0.095	0.105	0.099
East San Bernardino Valley	Redlands (06-071-4003)	0.112	0.103	0.105	0.106
Central San Bernardino Valley	San Bernardino (06-071-9004)	0.105	0.103	0.107	0.105
a  The required annual 75 percent completeness criterion was not met, therefore the annual 4th highest daily maximum values were not provided.
b  The design values for the Azusa, LAX Hastings, Mission Viejo, Perris, and Upland sites are invalid due to temporary or permanent closures of the sites. All other design values are valid.
Source: EPA, AQS Design Value (AMP480), Report Request ID: 2200476, July 10, 2024. Also see Memorandum dated July 19, 2024, from Jennifer Williams and Ben Wells, EPA, to Docket ID No. EPA-R09-OAR-2024-0327, Subject: “Correction to Design Values for the 1997 8-hour Ozone NAAQS in Los Angeles-South Coast Air Basin, CA Nonattainment Area.”