Eight-Hour Ozone High Value Days for 2018
as of June 19
The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 71 parts per billion in 2018 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.
| 2018 Sorted by Maximum Value | |||||||
|---|---|---|---|---|---|---|---|
| Location | Region | CAMS | AQS | Date | Time | Value | POC |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | May 17 2018 | 11:00 | 92 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | May 26 2018 | 11:00 | 89 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | April 24 2018 | 11:00 | 88 | 1 N |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | April 28 2018 | 11:00 | 88 | 2 |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | May 7 2018 | 10:00 | 88 | 2 |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | May 7 2018 | 11:00 | 88 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | May 7 2018 | 11:00 | 88 | 1 |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | April 28 2018 | 11:00 | 86 | 1 N |
| Lang C408 | 12 | 408 | 48_201_0047 | April 28 2018 | 10:00 | 85 | 2 |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | April 25 2018 | 09:00 | 85 | 1 N |
| Atascocita C560 | 12 | 560 | 48_201_0560 | May 7 2018 | 11:00 | 85 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | May 17 2018 | 10:00 | 85 | 1 |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | May 15 2018 | 10:00 | 85 | 1 |
| Keller C17 | 4 | 17 | 48_439_2003 | May 17 2018 | 11:00 | 85 | 2 |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | May 7 2018 | 10:00 | 84 | 1 N |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | May 7 2018 | 11:00 | 84 | 2 |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | May 7 2018 | 10:00 | 84 | 1 |
| Seabrook Friendship Park C45 | 12 | 45 | 48_201_1050 | April 24 2018 | 12:00 | 84 | 1 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | May 7 2018 | 09:00 | 83 | 1 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | May 26 2018 | 11:00 | 83 | 1 |
| Chamizal C41/AH126 | 6 | 41 | 48_141_0044 | June 4 2018 | 11:00 | 83 | 1 |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | April 24 2018 | 12:00 | 83 | 1 |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | May 7 2018 | 11:00 | 83 | 1 |
| Northwest Harris Co. C26/A110/X154 | 12 | 26 | 48_201_0029 | April 28 2018 | 11:00 | 83 | 2 |
| Lynchburg Ferry C1015/A165 | 12 | 1015 | 48_201_1015 | May 7 2018 | 11:00 | 83 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | May 17 2018 | 11:00 | 83 | 2 |
| El Paso UTEP C12/A125/X151 | 6 | 12 | 48_141_0037 | June 4 2018 | 11:00 | 82 | 2 |
| Ascarate Park SE C37/A332/A172/X159 | 6 | 37 | 48_141_0055 | June 4 2018 | 11:00 | 82 | 1 |
| Houston North Wayside C405 | 12 | 405 | 48_201_0046 | April 28 2018 | 10:00 | 82 | 1 |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | May 7 2018 | 11:00 | 82 | 1 N |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | May 15 2018 | 10:00 | 82 | 1 N |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | May 17 2018 | 10:00 | 82 | 1 N |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | April 28 2018 | 10:00 | 82 | 2 |
| Killeen Skylark Field C1047 | 9 | 1047 | 48_027_1047 | May 7 2018 | 11:00 | 81 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | May 7 2018 | 12:00 | 81 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | May 26 2018 | 11:00 | 81 | 1 |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | April 24 2018 | 11:00 | 81 | 3 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | April 28 2018 | 12:00 | 81 | 1 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | May 6 2018 | 12:00 | 81 | 1 |
| Dallas Executive Airport C402 | 4 | 402 | 48_113_0087 | April 24 2018 | 11:00 | 81 | 1 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | April 28 2018 | 12:00 | 81 | 3 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | May 7 2018 | 10:00 | 81 | 3 |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | May 15 2018 | 09:00 | 81 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | April 25 2018 | 09:00 | 81 | 1 |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | May 15 2018 | 09:00 | 81 | 1 |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | May 16 2018 | 12:00 | 81 | 1 |
| Rockwall Heath C69 | 4 | 69 | 48_397_0001 | May 6 2018 | 11:00 | 81 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | May 26 2018 | 11:00 | 80 | 1 |
| UH West Liberty C699 | 12 | 699 | 48_291_0699 | April 25 2018 | 09:00 | 80 | 1 N |
| Fair Oaks Ranch C502 | 13 | 502 | 48_029_0502 | May 7 2018 | 11:00 | 79 | 1 N |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | May 6 2018 | 11:00 | 79 | 3 |
| Houston North Wayside C405 | 12 | 405 | 48_201_0046 | May 7 2018 | 10:00 | 79 | 1 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | April 28 2018 | 10:00 | 79 | 1 |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | May 7 2018 | 10:00 | 79 | 1 N |
| Rockwall Heath C69 | 4 | 69 | 48_397_0001 | April 28 2018 | 11:00 | 79 | 1 |
| Bulverde Elementary C503 | 13 | 503 | 48_091_0503 | May 7 2018 | 11:00 | 78 | 1 N |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | April 25 2018 | 10:00 | 78 | 2 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | May 7 2018 | 11:00 | 78 | 1 |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | May 17 2018 | 10:00 | 78 | 1 N |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | April 25 2018 | 09:00 | 78 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | April 28 2018 | 10:00 | 78 | 1 N |
| HRM-3 Haden Road C603/A114 | 12 | 603 | 48_201_0803 | April 28 2018 | 10:00 | 78 | 1 N |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | April 23 2018 | 12:00 | 77 | 1 |
| Manvel Croix Park C84 | 12 | 84 | 48_039_1004 | April 24 2018 | 11:00 | 77 | 1 |
| Skyline Park C72 | 6 | 72 | 48_141_0058 | June 4 2018 | 11:00 | 77 | 1 |
| Houston Westhollow C410 | 12 | 410 | 48_201_0066 | April 28 2018 | 10:00 | 77 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | May 7 2018 | 11:00 | 77 | 1 |
| Atascocita C560 | 12 | 560 | 48_201_0560 | April 25 2018 | 10:00 | 77 | 1 N |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | April 28 2018 | 10:00 | 77 | 1 N |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | April 28 2018 | 11:00 | 77 | 1 |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | May 17 2018 | 11:00 | 77 | 2 |
| Hamshire C64/C654 | 10 | 64 | 48_245_0022 | May 17 2018 | 10:00 | 77 | 1 |
| SETRPC Port Arthur C628 | 10 | 628 | 48_245_0628 | May 17 2018 | 08:00 | 77 | 1 N |
| UH WG Jones Forest C698 | 12 | 698 | 48_339_0698 | May 15 2018 | 12:00 | 77 | 1 N |
| SETRPC Mauriceville 42 C642/C311/C665 | 10 | 642 | 48_361_1100 | April 25 2018 | 11:00 | 77 | 1 N |
| SETRPC Mauriceville 42 C642/C311/C665 | 10 | 642 | 48_361_1100 | April 28 2018 | 11:00 | 77 | 1 N |
| Keller C17 | 4 | 17 | 48_439_2003 | April 24 2018 | 12:00 | 77 | 2 |
| Arlington Municipal Airport C61 | 4 | 61 | 48_439_3011 | April 24 2018 | 12:00 | 77 | 1 |
| CAPCOG Lake Georgetown C690 | 11 | 690 | 48_491_0690 | May 7 2018 | 10:00 | 77 | 1 N |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | April 28 2018 | 11:00 | 76 | 3 |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | May 7 2018 | 11:00 | 76 | 1 |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | April 27 2018 | 12:00 | 76 | 1 |
| Atascocita C560 | 12 | 560 | 48_201_0560 | May 15 2018 | 10:00 | 76 | 1 N |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | April 24 2018 | 12:00 | 76 | 1 |
| SETRPC 40 Sabine Pass C640/C1654 | 10 | 640 | 48_245_0101 | April 25 2018 | 11:00 | 76 | 1 |
| UH WG Jones Forest C698 | 12 | 698 | 48_339_0698 | June 8 2018 | 10:00 | 76 | 1 N |
| Rockwall Heath C69 | 4 | 69 | 48_397_0001 | May 7 2018 | 11:00 | 76 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | April 24 2018 | 12:00 | 76 | 2 |
| Temple Georgia C1045 | 9 | 1045 | 48_027_1045 | May 7 2018 | 11:00 | 75 | 1 |
| Killeen Skylark Field C1047 | 9 | 1047 | 48_027_1047 | April 28 2018 | 10:00 | 75 | 1 |
| San Antonio Northwest C23 | 13 | 23 | 48_029_0032 | May 7 2018 | 10:00 | 75 | 2 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | April 28 2018 | 12:00 | 75 | 1 |
| City of Garden Ridge C505 | 13 | 505 | 48_091_0505 | May 7 2018 | 10:00 | 75 | 1 N |
| Dallas North No.2 C63/C679 | 4 | 63 | 48_113_0075 | April 24 2018 | 11:00 | 75 | 1 |
| Dallas Executive Airport C402 | 4 | 402 | 48_113_0087 | April 28 2018 | 11:00 | 75 | 1 |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | May 17 2018 | 12:00 | 75 | 2 |
| Beaumont-Downtown C2/A112/C2002 | 10 | 2 | 48_245_0009 | April 28 2018 | 11:00 | 75 | 2 |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | May 9 2018 | 11:00 | 75 | 1 |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | May 14 2018 | 11:00 | 75 | 1 |
| UH WG Jones Forest C698 | 12 | 698 | 48_339_0698 | April 28 2018 | 12:00 | 75 | 1 N |
| West Orange C9/A141 | 10 | 9 | 48_361_1001 | April 25 2018 | 10:00 | 75 | 2 |
| Parker County C76 | 4 | 76 | 48_367_0081 | May 17 2018 | 11:00 | 75 | 1 |
| Keller C17 | 4 | 17 | 48_439_2003 | April 28 2018 | 11:00 | 75 | 2 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | May 29 2018 | 11:00 | 74 | 1 |
| Ivanhoe C414 | 6 | 414 | 48_141_0029 | June 4 2018 | 11:00 | 74 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | May 7 2018 | 10:00 | 74 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | April 25 2018 | 10:00 | 74 | 1 N |
| UH WG Jones Forest C698 | 12 | 698 | 48_339_0698 | May 8 2018 | 11:00 | 74 | 1 N |
| Eagle Mountain Lake C75 | 4 | 75 | 48_439_0075 | April 24 2018 | 11:00 | 74 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | April 24 2018 | 11:00 | 74 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | May 7 2018 | 11:00 | 74 | 1 |
| Arlington Municipal Airport C61 | 4 | 61 | 48_439_3011 | May 26 2018 | 10:00 | 74 | 1 |
| San Antonio Northwest C23 | 13 | 23 | 48_029_0032 | April 23 2018 | 12:00 | 73 | 2 |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | April 24 2018 | 09:00 | 73 | 1 |
| Heritage Middle School C622 | 13 | 622 | 48_029_0622 | May 6 2018 | 11:00 | 73 | 1 N |
| City of Garden Ridge C505 | 13 | 505 | 48_091_0505 | May 16 2018 | 11:00 | 73 | 1 N |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | May 26 2018 | 11:00 | 73 | 3 |
| Dallas Executive Airport C402 | 4 | 402 | 48_113_0087 | May 6 2018 | 11:00 | 73 | 1 |
| Midlothian OFW C52/A137 | 4 | 52 | 48_139_0016 | April 24 2018 | 12:00 | 73 | 1 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | May 15 2018 | 10:00 | 73 | 3 |
| Lang C408 | 12 | 408 | 48_201_0047 | May 7 2018 | 11:00 | 73 | 2 |
| Houston Bayland Park C53/A146 | 12 | 53 | 48_201_0055 | April 25 2018 | 10:00 | 73 | 1 |
| Park Place C416 | 12 | 416 | 48_201_0416 | April 28 2018 | 10:00 | 73 | 1 |
| Houston East C1/G316 | 12 | 1 | 48_201_1034 | April 25 2018 | 10:00 | 73 | 2 |
| Clinton C403/C304/AH113 | 12 | 403 | 48_201_1035 | April 28 2018 | 10:00 | 73 | 3 |
| Clinton C403/C304/AH113 | 12 | 403 | 48_201_1035 | May 7 2018 | 11:00 | 73 | 3 |
| Greenville C1006/A198 | 4 | 1006 | 48_231_1006 | May 7 2018 | 10:00 | 73 | 1 |
| SETRPC 43 Jefferson Co Airport C643 | 10 | 643 | 48_245_0102 | April 28 2018 | 11:00 | 73 | 1 |
| Nederland High School C1035 | 10 | 1035 | 48_245_1035 | April 28 2018 | 12:00 | 73 | 1 |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | May 10 2018 | 10:00 | 73 | 1 |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | June 8 2018 | 11:00 | 73 | 1 |
| UH WG Jones Forest C698 | 12 | 698 | 48_339_0698 | May 9 2018 | 10:00 | 73 | 1 N |
| West Orange C9/A141 | 10 | 9 | 48_361_1001 | May 8 2018 | 10:00 | 73 | 2 |
| West Orange C9/A141 | 10 | 9 | 48_361_1001 | May 16 2018 | 11:00 | 73 | 2 |
| Tyler Airport Relocated C82 | 5 | 82 | 48_423_0007 | April 28 2018 | 10:00 | 73 | 1 |
| Keller C17 | 4 | 17 | 48_439_2003 | May 26 2018 | 11:00 | 73 | 2 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | April 28 2018 | 12:00 | 73 | 1 |
| Grapevine Fairway C70/A301/X182 | 4 | 70 | 48_439_3009 | May 17 2018 | 11:00 | 73 | 1 |
| CAPCOG Lake Georgetown C690 | 11 | 690 | 48_491_0690 | April 28 2018 | 10:00 | 73 | 1 N |
| Camp Bullis C58 | 13 | 58 | 48_029_0052 | April 28 2018 | 10:00 | 72 | 1 |
| Fair Oaks Ranch C502 | 13 | 502 | 48_029_0502 | April 28 2018 | 10:00 | 72 | 1 N |
| Dallas Executive Airport C402 | 4 | 402 | 48_113_0087 | May 7 2018 | 11:00 | 72 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | May 29 2018 | 10:00 | 72 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | May 7 2018 | 11:00 | 72 | 1 |
| Italy C1044/A323 | 4 | 1044 | 48_139_1044 | May 16 2018 | 12:00 | 72 | 1 |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | April 28 2018 | 11:00 | 72 | 1 |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | April 29 2018 | 10:00 | 72 | 2 |
| Houston Aldine C8/AF108/X150 | 12 | 8 | 48_201_0024 | June 8 2018 | 09:00 | 72 | 2 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | May 17 2018 | 10:00 | 72 | 3 |
| Northwest Harris Co. C26/A110/X154 | 12 | 26 | 48_201_0029 | April 29 2018 | 10:00 | 72 | 2 |
| Lang C408 | 12 | 408 | 48_201_0047 | April 25 2018 | 09:00 | 72 | 2 |
| Park Place C416 | 12 | 416 | 48_201_0416 | April 24 2018 | 12:00 | 72 | 1 |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | May 8 2018 | 11:00 | 72 | 1 N |
| Crosby Library C553 | 12 | 553 | 48_201_0553 | May 16 2018 | 11:00 | 72 | 1 N |
| Atascocita C560 | 12 | 560 | 48_201_0560 | May 17 2018 | 11:00 | 72 | 1 N |
| UH Moody Tower C695 | 12 | 695 | 48_201_0695 | April 24 2018 | 11:00 | 72 | 1 N |
| Hamshire C64/C654 | 10 | 64 | 48_245_0022 | April 25 2018 | 09:00 | 72 | 1 |
| SETRPC 43 Jefferson Co Airport C643 | 10 | 643 | 48_245_0102 | May 15 2018 | 09:00 | 72 | 1 |
| SETRPC Port Arthur C628 | 10 | 628 | 48_245_0628 | May 15 2018 | 09:00 | 72 | 1 N |
| UH West Liberty C699 | 12 | 699 | 48_291_0699 | May 15 2018 | 10:00 | 72 | 1 N |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | May 29 2018 | 11:00 | 72 | 1 |
| Corsicana Airport C1051 | 4 | 1051 | 48_349_1051 | April 28 2018 | 10:00 | 72 | 1 |
| West Orange C9/A141 | 10 | 9 | 48_361_1001 | April 28 2018 | 10:00 | 72 | 2 |
| SETRPC Mauriceville 42 C642/C311/C665 | 10 | 642 | 48_361_1100 | May 8 2018 | 11:00 | 72 | 1 N |
| SETRPC Mauriceville 42 C642/C311/C665 | 10 | 642 | 48_361_1100 | May 16 2018 | 12:00 | 72 | 1 N |
| Parker County C76 | 4 | 76 | 48_367_0081 | April 24 2018 | 12:00 | 72 | 1 |
| Ft. Worth Northwest C13/AH302 | 4 | 13 | 48_439_1002 | May 26 2018 | 11:00 | 72 | 2 |
| Austin Northwest C3/A322 | 11 | 3 | 48_453_0014 | May 7 2018 | 10:00 | 72 | 2 |
| Temple Georgia C1045 | 9 | 1045 | 48_027_1045 | April 28 2018 | 09:00 | 71 | 1 |
| Killeen Skylark Field C1047 | 9 | 1047 | 48_027_1047 | May 8 2018 | 11:00 | 71 | 1 |
| CPS Pecan Valley C678 | 13 | 678 | 48_029_0055 | May 6 2018 | 10:00 | 71 | 1 N |
| Calaveras Lake C59 | 13 | 59 | 48_029_0059 | May 6 2018 | 11:00 | 71 | 1 |
| Calaveras Lake C59 | 13 | 59 | 48_029_0059 | May 7 2018 | 11:00 | 71 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | April 24 2018 | 11:00 | 71 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | May 8 2018 | 11:00 | 71 | 1 |
| Frisco C31/C680 | 4 | 31 | 48_085_0005 | May 29 2018 | 10:00 | 71 | 1 |
| City of Garden Ridge C505 | 13 | 505 | 48_091_0505 | April 23 2018 | 12:00 | 71 | 1 N |
| Dallas Hinton St. C401/C60/AH161 | 4 | 401 | 48_113_0069 | May 7 2018 | 11:00 | 71 | 3 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | April 28 2018 | 11:00 | 71 | 1 |
| Denton Airport South C56/A163/X157 | 4 | 56 | 48_121_0034 | June 5 2018 | 10:00 | 71 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | May 8 2018 | 11:00 | 71 | 1 |
| Pilot Point C1032 | 4 | 1032 | 48_121_1032 | May 18 2018 | 10:00 | 71 | 1 |
| Italy C1044/A323 | 4 | 1044 | 48_139_1044 | May 7 2018 | 10:00 | 71 | 1 |
| Skyline Park C72 | 6 | 72 | 48_141_0058 | May 22 2018 | 10:00 | 71 | 1 |
| Texas City 34th St. C620 | 12 | 620 | 48_167_0056 | April 27 2018 | 12:00 | 71 | 1 N |
| Galveston 99th St. C1034/A320/X183 | 12 | 1034 | 48_167_1034 | April 26 2018 | 12:00 | 71 | 1 |
| Channelview C15/AH115 | 12 | 15 | 48_201_0026 | April 25 2018 | 09:00 | 71 | 3 |
| Wallisville Road C617 | 12 | 617 | 48_201_0617 | May 8 2018 | 10:00 | 71 | 1 N |
| Lynchburg Ferry C1015/A165 | 12 | 1015 | 48_201_1015 | April 28 2018 | 11:00 | 71 | 1 |
| Baytown Garth C1017 | 12 | 1017 | 48_201_1017 | May 8 2018 | 10:00 | 71 | 1 |
| Hou.DeerPrk2 C35/235/1001/AFH139FP239 | 12 | 35 | 48_201_1039 | April 28 2018 | 10:00 | 71 | 1 |
| Dripping Springs School C614 | 11 | 614 | 48_209_0614 | May 7 2018 | 11:00 | 71 | 1 N |
| Beaumont-Downtown C2/A112/C2002 | 10 | 2 | 48_245_0009 | April 25 2018 | 10:00 | 71 | 2 |
| SETRPC 40 Sabine Pass C640/C1654 | 10 | 640 | 48_245_0101 | April 28 2018 | 11:00 | 71 | 1 |
| SETRPC 43 Jefferson Co Airport C643 | 10 | 643 | 48_245_0102 | April 25 2018 | 10:00 | 71 | 1 |
| Cleburne Airport C77/C682 | 4 | 77 | 48_251_0003 | April 24 2018 | 11:00 | 71 | 1 |
| UH West Liberty C699 | 12 | 699 | 48_291_0699 | April 28 2018 | 11:00 | 71 | 1 N |
| Conroe Relocated C78/A321 | 12 | 78 | 48_339_0078 | May 8 2018 | 11:00 | 71 | 1 |
| Rockwall Heath C69 | 4 | 69 | 48_397_0001 | April 24 2018 | 11:00 | 71 | 1 |
| Gorzycki Middle School C1603 | 11 | 1603 | 48_453_1603 | May 7 2018 | 11:00 | 71 | 1 N |
| CAPCOG Hutto College Street C6602 | 11 | 6602 | 48_491_6602 | May 7 2018 | 10:00 | 71 | 1 N |
| 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.