Multi Year Summary Data
This page provides a summary by year of the air quality data since continuous air monitoring operations began in 2020, which is considered the base year for year to year comparison purposes. This table is updated once a year each spring after all the previous year’s data have been analyzed.
Gregory-Portland Air Quality Through the Years
| Parameter | Calendar Year → | Base Year – 2020 | 2021 | 2022 | 2023 | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| NAAQS or TCEQ AMCV ↓ | Design Value to Compare with NAAQS or TCEQ AMCV | |||||||||
| Nitrogen Dioxide (NO2) GF Only | Annual average less than 53 ppb | 2.7 ppb | 2.6 ppb | 2.7 ppb | 3.0 ppb | |||||
| Sulfur Dioxide (SO2) GF Only | 99th p-tile less than 75 ppb | 2.5 ppb | 2.0 ppb | 2.6 ppb | 1.9 ppb | |||||
| Fine Particulate Matter (PM 2.5) GF, PBG & PBway | Annual average less than 9 1 µg/m3 (Averaged over 3 Years) |
8.9 µg/m3 | 7.6 µg/m3 | 8.1 µg/m3 | 8.4 µg/m3 | |||||
| Benzene GF, PBG & PBway | Annual average less than 8.4 ppbC | 0.67 ppbC | 0.65 ppbC | 0.58 ppbC | 0.58 ppbC | |||||
| Total Nonmethane Hydrocarbons | N/A; annual averages shown | 63.3 ppbC | 52.0 ppbC | 51.0 ppbC | 51.8 ppbC | |||||
| Highest Maximum Hourly or 24-Hourly Values Measured at Any Station | ||||||||||
| Benzene GF, PBG & PBway | 1-hr less than 1080 ppbC | 22.2 ppbC | 22.9 ppbC | 40.2 ppbC | 49.3 ppbC | |||||
| 1,3-butadiene GF, PBG & PBway | 1-hr less than 6,800 ppbC | 14.2 ppbC | 16.4 ppbC | 200 ppbC | 38.6 ppbC | |||||
| Ethylene Oxide PBG & PBway | 24-hr less than 4.8 ppbC | 0.36 ppbC | 0.80 ppbC | 0.38 ppbC | 0.60 ppbC | |||||
| Total Nonmethane Hydrocarbons GF, PBG & PBway | NA highest 1 hr value shown | 2,317 ppbC | 1,321 ppbC | 2,786 ppbC | 5,135 ppbC | |||||
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