| Ozone Eight-Hour Maximum (PPB) |
| The information in this report is based on preliminary data and is subject to change. |
| 04/17 | 04/18 | 04/19 | 04/20 | 04/21 | 04/22 | 04/23 |
| San Joaquin |
| Stockton-University | 43 | 45 | 44 | 41 | 42 | 45 | 42 |
| Manteca |
| Tracy-Airport | 34 | 40 | 42 | 41 | 34 | 42 | 35 |
| Stanislaus |
| Modesto-14th | 48 | 50 | 53 | 45 | 49 | 53 | 47 |
| Turlock | 51 | 52 | 58 | 46 | 50 | 57 | 43 |
| Merced |
| Merced-M St. |
| Merced-Vierra | 45 | 51 | 59 | 44 | 45 | 48 | 43 |
| Madera |
| Madera-City | 50 | 51 | 57 | 44 | 42 | 53 | 47 |
| Madera | 49 | 51 | 58 | 46 | 42 | 53 | 47 |
| Fresno |
| Fresno-SSP | 50 | 51 | 56 | 45 | 44 | 54 | 47 |
| Clovis | 50 | 56 | 54 | 44 | 48 | 68 | 53 |
| Fresno-Garland | 46 | 51 | 49 | 41 | 43 | 56 | 47 |
| Fresno-Foundry |
| Fresno-Pacific |
| Fresno-Drummond | 52 | 54 | 58 | 47 | 49 | 57 | 51 |
| Parlier | 57 | 55 | 58 | 54 | 49 | 61 | 49 |
| Tranquillity | 42 | 45 | 56 | 37 | 40 | 42 | 40 |
| Huron |
| Kings |
| Hanford | 56 | 58 | 61 | 49 | 49 | 55 | 46 |
| Corcoran |
| Tulare |
| Visalia-Ashland | 58 | 55 | 57 | 58 | 49 | 63 | 47 |
| Porterville | 61 | 58 | 55 | 59 | 48 | 57 | 48 |
| Ash Mountain-SNP | 42 | 45 | 48 | 49 | 42 | 53 | 46 |
| Lower Kaweah-SNP | 46 | 43 | 47 | 47 | 54 | 56 | 47 |
| Kern |
| Shafter | 59 | 56 | 59 | 57 | 46 | 53 | 46 |
| Oildale | 64 | 58 | 58 | 62 | 52 | 58 | 48 |
| Bakersfield-Gold |
| Bakersfield-Calif | 60 | 55 | 58 | 61 | 54 | 57 | 47 |
| Bakersfield-Muni | 60 | 54 | 55 | 60 | 54 | 55 | 45 |
| Edison | 68 | 61 | 59 | 65 | 60 | 64 | 49 |
| Arvin-DiGiorgio | 67 | 58 | 58 | 64 | 55 | 62 | 51 |
| Maricopa | 60 | 55 | 53 | 56 | 48 | 54 | 48 |
| Lebec |
| District Maximum | 68 | | 61 | | 61 | | 65 | | 60 | | 68 | | 53 |
| Maximum Measured | Unofficial Days Over the Federal and State Standards¹ |
| Value for This Year |
| Pollutant | Maximum | Federal 2015 8-Hr Ozone | 1 | | Federal 1997 24-hr PM2.5 | 0 |
| Federal 2008 8-Hr Ozone | 0 | | Federal 24-hr PM10 | 0 |
| O3-1hr (ppb) | 82 | | Federal 1997 8-Hr Ozone | 0 | | State 1-Hr Ozone | 0 |
| O3-8hr (ppb) | 71 | | Federal 1-Hr Ozone | 0 | | State 1997 8-Hr Ozone | 1 |
| PM 10 (µg/m³) | 72 | | Federal 2006 24-hr PM2.5 | 0 | | State 24-hr PM10 | 6 |
| PM 2.5 (µg/m³) | 32.2 |
¹Data affected by smoke, high winds, fireworks, and etc. and which exceeded a federal standard are denoted |
with an ‘x’ in the table above. Values marked with an ‘x’ are not included in the tallies above. |
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Wednesday, April 24, 2024 | Page 1 of 1 |