Eight-Hour Ozone High Value Days for 2021
as of September 20
The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 71 parts per billion in 2021 in each community where the TCEQ measures ozone. This information is updated hourly. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) Times shown are in 24-hour format and are Local Standard Time. Our convention is that the time reflects the beginning of the eight-hour average. All ozone measurements are in parts per billion.Use the selection boxes below to customize this report. You may select a different year, a different sorting order, or a different report format. Click on the Generate Report button once you have made your selections.
| 2021 Sorted by Maximum Value | |||||||
|---|---|---|---|---|---|---|---|
| Location | Region | CAMS | AQS | Date | Time | Value | POC |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | June 16 2021 | 12:00 | 114 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | June 16 2021 | 11:00 | 102 | 2 |
| Keller C17 | 4 | 17 | 48_439_2003 | June 16 2021 | 11:00 | 100 | 2 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | June 16 2021 | 12:00 | 97 | 1 |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | July 26 2021 | 11:00 | 97 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | June 16 2021 | 10:00 | 96 | 1 |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | June 16 2021 | 10:00 | 95 | 3 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | June 15 2021 | 11:00 | 95 | 2 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | May 29 2021 | 12:00 | 90 | 3 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | September 8 2021 | 11:00 | 89 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | June 19 2021 | 11:00 | 89 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | September 7 2021 | 11:00 | 89 | 1 |
| Lang C408 | 12 | 408 | 48_201_0047 | April 11 2021 | 11:00 | 89 | 2 |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | May 29 2021 | 11:00 | 89 | 1 N |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | June 19 2021 | 09:00 | 89 | 1 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | June 16 2021 | 10:00 | 88 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | September 7 2021 | 11:00 | 87 | 1 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | June 17 2021 | 09:00 | 87 | 2 |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | April 11 2021 | 11:00 | 86 | 2 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | June 18 2021 | 11:00 | 86 | 1 |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | May 29 2021 | 11:00 | 86 | 2 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | June 17 2021 | 10:00 | 85 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | June 19 2021 | 11:00 | 85 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | June 16 2021 | 11:00 | 85 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | June 17 2021 | 11:00 | 85 | 1 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | July 27 2021 | 11:00 | 85 | 2 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | June 16 2021 | 10:00 | 85 | 2 |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | July 26 2021 | 12:00 | 85 | 1 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | September 10 2021 | 11:00 | 84 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | July 30 2021 | 12:00 | 84 | 1 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | July 9 2021 | 10:00 | 84 | 2 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | September 8 2021 | 10:00 | 83 | 2 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | September 8 2021 | 10:00 | 83 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | June 19 2021 | 10:00 | 82 | 1 |
| Houston Westhollow C410/C3003 | 12 | 410 | 48_201_0066 | June 18 2021 | 11:00 | 82 | 1 |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | July 26 2021 | 11:00 | 82 | 1 N |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | July 30 2021 | 11:00 | 82 | 1 |
| Oyster Creek C1607 | 12 | 1607 | 48_039_1607 | September 9 2021 | 10:00 | 81 | 1 N |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | June 16 2021 | 11:00 | 81 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | July 29 2021 | 11:00 | 81 | 1 |
| Socorro Hueco C49/F312 | 6 | 49 | 48_141_0057 | July 5 2021 | 11:00 | 81 | 1 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | July 26 2021 | 12:00 | 81 | 3 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | June 18 2021 | 10:00 | 81 | 2 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | July 28 2021 | 11:00 | 81 | 2 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | September 8 2021 | 10:00 | 81 | 1 |
| West Houston C554 | 12 | 554 | 48_201_0554 | June 18 2021 | 09:00 | 81 | 1 N |
| La Porte Sylvan Beach C556 | 12 | 556 | 48_201_0556 | June 19 2021 | 09:00 | 81 | 1 N |
| Tom Bass C558 | 12 | 558 | 48_201_0558 | September 8 2021 | 10:00 | 81 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | May 29 2021 | 11:00 | 81 | 1 |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | September 8 2021 | 13:00 | 81 | 1 |
| Parker County C76 | 4 | 76 | 48_367_0081 | June 16 2021 | 13:00 | 81 | 1 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | June 22 2021 | 11:00 | 80 | 2 |
| Ojo De Agua C1021/FG121/FG221 | 6 | 1021 | 48_141_1021 | July 27 2021 | 11:00 | 80 | 1 |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | June 15 2021 | 09:00 | 80 | 1 N |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | August 3 2021 | 11:00 | 80 | 1 |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | July 29 2021 | 12:00 | 80 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | June 13 2021 | 12:00 | 80 | 2 |
| Elm Creek Elementary C501 | 13 | 501 | 48_029_0501 | September 10 2021 | 11:00 | 79 | 1 N |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | September 9 2021 | 11:00 | 79 | 1 |
| Lake Jackson C1016 | 12 | 1016 | 48_039_1016 | September 9 2021 | 11:00 | 79 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | June 18 2021 | 10:00 | 79 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | June 15 2021 | 09:00 | 79 | 1 |
| Seabrook Friendship Park C45 | 12 | 45 | 48_201_1050 | June 19 2021 | 09:00 | 79 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | July 29 2021 | 11:00 | 79 | 1 |
| Dallas Executive Airport C402 | 4 | 402 | 48_113_0087 | June 16 2021 | 10:00 | 78 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | June 17 2021 | 11:00 | 78 | 1 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | June 15 2021 | 09:00 | 78 | 1 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | June 17 2021 | 09:00 | 78 | 1 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | July 28 2021 | 11:00 | 78 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | June 15 2021 | 09:00 | 78 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | June 16 2021 | 10:00 | 78 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | June 17 2021 | 09:00 | 78 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | April 11 2021 | 11:00 | 78 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | August 25 2021 | 11:00 | 78 | 1 |
| West Houston C554 | 12 | 554 | 48_201_0554 | June 15 2021 | 08:00 | 78 | 1 N |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | July 26 2021 | 11:00 | 78 | 2 |
| Clinton C403/C304/AH113 | 12 | 403 | 48_201_1035 | July 26 2021 | 11:00 | 78 | 3 |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | June 15 2021 | 09:00 | 78 | 1 N |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | July 28 2021 | 10:00 | 77 | 1 |
| UH Smith Point C1606 | 12 | 1606 | 48_071_1606 | June 19 2021 | 09:00 | 77 | 1 N |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | September 7 2021 | 11:00 | 77 | 1 |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | June 14 2021 | 11:00 | 77 | 1 |
| West Houston C554 | 12 | 554 | 48_201_0554 | September 8 2021 | 10:00 | 77 | 1 N |
| Granbury C73/C681 | 4 | 73 | 48_221_0001 | June 15 2021 | 12:00 | 77 | 1 |
| Keller C17 | 4 | 17 | 48_439_2003 | July 27 2021 | 12:00 | 77 | 2 |
| Keller C17 | 4 | 17 | 48_439_2003 | July 29 2021 | 11:00 | 77 | 2 |
| San Antonio Northwest C23 | 13 | 23 | 48_029_0032 | September 10 2021 | 11:00 | 76 | 2 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | April 11 2021 | 11:00 | 76 | 1 |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | June 19 2021 | 10:00 | 76 | 3 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | June 17 2021 | 10:00 | 76 | 1 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | September 7 2021 | 11:00 | 76 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | June 18 2021 | 09:00 | 76 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | July 28 2021 | 11:00 | 76 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | July 22 2021 | 10:00 | 76 | 1 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | June 15 2021 | 08:00 | 76 | 2 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | May 29 2021 | 11:00 | 76 | 1 |
| West Houston C554 | 12 | 554 | 48_201_0554 | June 17 2021 | 09:00 | 76 | 1 N |
| Tom Bass C558 | 12 | 558 | 48_201_0558 | June 16 2021 | 10:00 | 76 | 1 N |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | May 29 2021 | 11:00 | 76 | 1 N |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | July 26 2021 | 12:00 | 76 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | June 17 2021 | 09:00 | 76 | 1 N |
| Lynchburg Ferry C1015/A165 | 12 | 1015 | 48_201_1015 | July 26 2021 | 12:00 | 76 | 1 |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | April 11 2021 | 10:00 | 76 | 2 |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | June 19 2021 | 09:00 | 76 | 2 |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | April 11 2021 | 11:00 | 76 | 1 N |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | June 15 2021 | 11:00 | 76 | 1 |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | July 7 2021 | 12:00 | 76 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | July 27 2021 | 12:00 | 76 | 2 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | July 29 2021 | 11:00 | 76 | 2 |
| Arlington Municipal Airport C61 | 4 | 61 | 48_439_3011 | June 15 2021 | 11:00 | 76 | 1 |
| Arlington Municipal Airport C61 | 4 | 61 | 48_439_3011 | September 8 2021 | 12:00 | 76 | 1 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | September 7 2021 | 10:00 | 75 | 1 |
| Socorro Hueco C49/F312 | 6 | 49 | 48_141_0057 | July 25 2021 | 11:00 | 75 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | September 9 2021 | 10:00 | 75 | 1 N |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | June 19 2021 | 10:00 | 75 | 2 |
| Houston North Wayside C405/C1033 | 12 | 405 | 48_201_0046 | April 11 2021 | 11:00 | 75 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | July 28 2021 | 11:00 | 75 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | June 19 2021 | 09:00 | 75 | 1 |
| Bunker Hill Village C562 | 12 | 562 | 48_201_0562 | June 18 2021 | 10:00 | 75 | 1 N |
| Bunker Hill Village C562 | 12 | 562 | 48_201_0562 | September 8 2021 | 10:00 | 75 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | June 18 2021 | 10:00 | 75 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | April 20 2021 | 11:00 | 75 | 1 |
| Clinton C403/C304/AH113 | 12 | 403 | 48_201_1035 | May 29 2021 | 11:00 | 75 | 3 |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | May 29 2021 | 11:00 | 75 | 1 N |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | June 17 2021 | 09:00 | 75 | 1 N |
| Dripping Springs School C614 | 11 | 614 | 48_209_0614 | September 10 2021 | 10:00 | 75 | 1 N |
| Beaumont-Downtown C2/A112/C2002 | 10 | 2 | 48_245_0009 | August 6 2021 | 10:00 | 75 | 2 |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | July 21 2021 | 11:00 | 75 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | September 7 2021 | 11:00 | 75 | 1 |
| Lake Jackson C1016 | 12 | 1016 | 48_039_1016 | September 8 2021 | 10:00 | 74 | 1 |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | June 13 2021 | 11:00 | 74 | 3 |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | June 17 2021 | 10:00 | 74 | 3 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | August 4 2021 | 11:00 | 74 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | September 10 2021 | 11:00 | 74 | 1 |
| Socorro Hueco C49/F312 | 6 | 49 | 48_141_0057 | July 17 2021 | 08:00 | 74 | 1 |
| Skyline Park C72 | 6 | 72 | 48_141_0058 | June 22 2021 | 11:00 | 74 | 1 |
| Ojo De Agua C1021/FG121/FG221 | 6 | 1021 | 48_141_1021 | June 22 2021 | 10:00 | 74 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | March 23 2021 | 11:00 | 74 | 1 N |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | June 16 2021 | 10:00 | 74 | 1 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | September 7 2021 | 10:00 | 74 | 1 |
| Houston Westhollow C410/C3003 | 12 | 410 | 48_201_0066 | July 28 2021 | 12:00 | 74 | 1 |
| Baytown Wetlands Center C552 | 12 | 552 | 48_201_0552 | July 26 2021 | 11:00 | 74 | 1 N |
| West Houston C554 | 12 | 554 | 48_201_0554 | May 14 2021 | 12:00 | 74 | 1 N |
| Tom Bass C558 | 12 | 558 | 48_201_0558 | June 17 2021 | 10:00 | 74 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | April 11 2021 | 10:00 | 74 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | May 29 2021 | 11:00 | 74 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | September 8 2021 | 10:00 | 74 | 1 N |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | April 11 2021 | 10:00 | 74 | 1 N |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | June 15 2021 | 10:00 | 74 | 2 |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | May 29 2021 | 10:00 | 74 | 1 |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | June 18 2021 | 10:00 | 74 | 1 N |
| SETRPC Mauriceville 42 C642/C311/C665 | 10 | 642 | 48_361_1100 | September 11 2021 | 10:00 | 74 | 1 N |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | June 15 2021 | 13:00 | 74 | 1 |
| Keller C17 | 4 | 17 | 48_439_2003 | July 30 2021 | 11:00 | 74 | 2 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | June 18 2021 | 10:00 | 73 | 1 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | June 19 2021 | 10:00 | 73 | 1 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | July 30 2021 | 10:00 | 73 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | September 12 2021 | 11:00 | 73 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | June 18 2021 | 09:00 | 73 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | August 5 2021 | 09:00 | 73 | 1 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | August 3 2021 | 09:00 | 73 | 2 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | August 6 2021 | 10:00 | 73 | 2 |
| Chamizal C41/AH126 | 6 | 41 | 48_141_0044 | June 22 2021 | 11:00 | 73 | 1 |
| Chamizal C41/AH126 | 6 | 41 | 48_141_0044 | July 9 2021 | 10:00 | 73 | 1 |
| Chamizal C41/AH126 | 6 | 41 | 48_141_0044 | July 27 2021 | 10:00 | 73 | 1 |
| Socorro Hueco C49/F312 | 6 | 49 | 48_141_0057 | July 23 2021 | 09:00 | 73 | 1 |
| Houston Westhollow C410/C3003 | 12 | 410 | 48_201_0066 | September 8 2021 | 11:00 | 73 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | September 8 2021 | 10:00 | 73 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | September 11 2021 | 10:00 | 73 | 1 |
| West Houston C554 | 12 | 554 | 48_201_0554 | July 28 2021 | 11:00 | 73 | 1 N |
| West Houston C554 | 12 | 554 | 48_201_0554 | September 7 2021 | 10:00 | 73 | 1 N |
| La Porte Sylvan Beach C556 | 12 | 556 | 48_201_0556 | July 26 2021 | 11:00 | 73 | 1 N |
| Tom Bass C558 | 12 | 558 | 48_201_0558 | July 28 2021 | 10:00 | 73 | 1 N |
| Bunker Hill Village C562 | 12 | 562 | 48_201_0562 | June 15 2021 | 08:00 | 73 | 1 N |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | April 20 2021 | 11:00 | 73 | 1 N |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | June 19 2021 | 09:00 | 73 | 1 N |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | September 8 2021 | 10:00 | 73 | 1 N |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | May 6 2021 | 11:00 | 73 | 1 |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | April 12 2021 | 10:00 | 73 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | July 21 2021 | 11:00 | 73 | 2 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | July 27 2021 | 11:00 | 73 | 1 |
| Arlington Municipal Airport C61 | 4 | 61 | 48_439_3011 | June 16 2021 | 09:00 | 73 | 1 |
| San Antonio Northwest C23 | 13 | 23 | 48_029_0032 | April 11 2021 | 11:00 | 72 | 2 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | July 29 2021 | 10:00 | 72 | 1 |
| Elm Creek Elementary C501 | 13 | 501 | 48_029_0501 | September 9 2021 | 10:00 | 72 | 1 N |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | June 16 2021 | 09:00 | 72 | 1 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | June 17 2021 | 10:00 | 72 | 1 |
| Oyster Creek C1607 | 12 | 1607 | 48_039_1607 | September 7 2021 | 11:00 | 72 | 1 N |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | July 30 2021 | 10:00 | 72 | 1 |
| Bulverde Elementary C503 | 13 | 503 | 48_091_0503 | April 11 2021 | 11:00 | 72 | 1 N |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | June 15 2021 | 10:00 | 72 | 3 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | July 29 2021 | 10:00 | 72 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | May 19 2021 | 11:00 | 72 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | August 6 2021 | 11:00 | 72 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | September 12 2021 | 11:00 | 72 | 1 |
| Midlothian OFW C52/A137 | 4 | 52 | 48_139_0016 | June 16 2021 | 09:00 | 72 | 1 |
| Skyline Park C72 | 6 | 72 | 48_141_0058 | July 27 2021 | 10:00 | 72 | 1 |
| Ojo De Agua C1021/FG121/FG221 | 6 | 1021 | 48_141_1021 | August 6 2021 | 11:00 | 72 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | September 6 2021 | 12:00 | 72 | 1 N |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | September 8 2021 | 09:00 | 72 | 1 N |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | September 7 2021 | 10:00 | 72 | 2 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | September 9 2021 | 10:00 | 72 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | April 11 2021 | 11:00 | 72 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | April 20 2021 | 11:00 | 72 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | May 29 2021 | 11:00 | 72 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | June 19 2021 | 08:00 | 72 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | June 17 2021 | 09:00 | 72 | 1 |
| Houston Harvard Street C417 | 12 | 417 | 48_201_0417 | June 18 2021 | 09:00 | 72 | 1 |
| Tom Bass C558 | 12 | 558 | 48_201_0558 | September 9 2021 | 11:00 | 72 | 1 N |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | April 20 2021 | 11:00 | 72 | 1 N |
| Lynchburg Ferry C1015/A165 | 12 | 1015 | 48_201_1015 | May 29 2021 | 11:00 | 72 | 1 |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | April 20 2021 | 10:00 | 72 | 1 |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | June 16 2021 | 10:00 | 72 | 1 |
| Mission C43/AP143 | 15 | 43 | 48_215_0043 | September 9 2021 | 10:00 | 72 | 1 |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | September 12 2021 | 11:00 | 72 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | August 26 2021 | 10:00 | 72 | 2 |
| Keller C17 | 4 | 17 | 48_439_2003 | June 13 2021 | 13:00 | 72 | 2 |
| Keller C17 | 4 | 17 | 48_439_2003 | June 15 2021 | 10:00 | 72 | 2 |
| Keller C17 | 4 | 17 | 48_439_2003 | June 19 2021 | 10:00 | 72 | 2 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | June 19 2021 | 10:00 | 72 | 1 |
| Killeen Skylark Field C1047 | 9 | 1047 | 48_027_1047 | September 8 2021 | 11:00 | 71 | 1 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | May 7 2021 | 10:00 | 71 | 1 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | April 20 2021 | 10:00 | 71 | 1 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | June 18 2021 | 09:00 | 71 | 1 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | September 10 2021 | 11:00 | 71 | 1 |
| Oyster Creek C1607 | 12 | 1607 | 48_039_1607 | July 28 2021 | 10:00 | 71 | 1 N |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | July 21 2021 | 10:00 | 71 | 3 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | September 10 2021 | 11:00 | 71 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | July 30 2021 | 10:00 | 71 | 1 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | May 5 2021 | 11:00 | 71 | 2 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | June 19 2021 | 10:00 | 71 | 2 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | July 3 2021 | 11:00 | 71 | 2 |
| El Paso UTEP C12/A125/X151/G125 | 6 | 12 | 48_141_0037 | July 21 2021 | 10:00 | 71 | 2 |
| Socorro Hueco C49/F312 | 6 | 49 | 48_141_0057 | July 22 2021 | 10:00 | 71 | 1 |
| Socorro Hueco C49/F312 | 6 | 49 | 48_141_0057 | September 14 2021 | 09:00 | 71 | 1 |
| Ojo De Agua C1021/FG121/FG221 | 6 | 1021 | 48_141_1021 | May 5 2021 | 10:00 | 71 | 1 |
| Ojo De Agua C1021/FG121/FG221 | 6 | 1021 | 48_141_1021 | July 9 2021 | 10:00 | 71 | 1 |
| Ojo De Agua C1021/FG121/FG221 | 6 | 1021 | 48_141_1021 | September 13 2021 | 11:00 | 71 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | April 20 2021 | 11:00 | 71 | 1 N |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | September 9 2021 | 09:00 | 71 | 1 |
| Northwest Harris Co. C26/A110/X154 | 12 | 26 | 48_201_0029 | September 11 2021 | 11:00 | 71 | 2 |
| Houston North Wayside C405/C1033 | 12 | 405 | 48_201_0046 | June 19 2021 | 09:00 | 71 | 1 |
| Lang C408 | 12 | 408 | 48_201_0047 | August 25 2021 | 11:00 | 71 | 2 |
| Lang C408 | 12 | 408 | 48_201_0047 | September 8 2021 | 09:00 | 71 | 2 |
| Houston Croquet C409 | 12 | 409 | 48_201_0051 | September 9 2021 | 10:00 | 71 | 2 |
| Houston Monroe C406 | 12 | 406 | 48_201_0062 | April 20 2021 | 10:00 | 71 | 1 |
| West Houston C554 | 12 | 554 | 48_201_0554 | June 16 2021 | 10:00 | 71 | 1 N |
| Meyer Park C561 | 12 | 561 | 48_201_0561 | April 11 2021 | 12:00 | 71 | 1 N |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | June 15 2021 | 09:00 | 71 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | September 19 2021 | 10:00 | 71 | 1 |
| Seabrook Friendship Park C45 | 12 | 45 | 48_201_1050 | July 26 2021 | 11:00 | 71 | 1 |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | April 20 2021 | 11:00 | 71 | 1 N |
| UH Launch Trailer C1611 | 12 | 1611 | 48_201_1611 | June 19 2021 | 09:00 | 71 | 1 N |
| Dripping Springs School C614 | 11 | 614 | 48_209_0614 | April 11 2021 | 12:00 | 71 | 1 N |
| SETRPC 43 Jefferson Co Airport C643 | 10 | 643 | 48_245_0102 | June 15 2021 | 10:00 | 71 | 1 |
| UH WG Jones Forest C698 | 12 | 698 | 48_339_0698 | April 12 2021 | 10:00 | 71 | 1 N |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | September 9 2021 | 11:00 | 71 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | June 19 2021 | 09:00 | 71 | 2 |
| Arlington Municipal Airport C61 | 4 | 61 | 48_439_3011 | July 21 2021 | 11:00 | 71 | 1 |
| POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site. | |||||||
| N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes. | |||||||
Interpreting the AQI
Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.
Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.
The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.
| AQI Breakpoint Definitions | ||
|---|---|---|
| AQI Range | 1hr Ozone in ppm |
8hr Ozone in ppm |
| 0 - 50 | Not Defined | 0 - 0.054 |
| 51 - 100 | Not Defined | 0.055 - 0.070 |
| 101 - 150 | 0.125 - 0.164 | 0.071 - 0.085 |
| 151 - 200 | 0.165 - 0.204 | 0.086 - 0.105 |
| 201 - 300 | 0.205 - 0.404 | 0.106 - 0.200 |
| 301 - 400 | 0.405 - 0.504 | Not Defined |
| 401 - 500 | Not Defined | Not Defined |
| 500+ | Not Defined | Not Defined |
- The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.
PLEASE NOTE: This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.
Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.