Check tomorrow's forecast
AirNow posts an air quality forecast by ZIP code, usually the day before.
AirNow →Air quality in Brazos County, TX
Includes College Station and Bryan · EPA monitor readings, 2021 to 2025 (fine particles only) · 234,000 people
For today's air and tomorrow's forecast, check AirNow by ZIP code.
Bad-air days a year
<1
day with an AQI over 100
1 bad-air day in 5 years of readings, 2021 to 2025. Brazos County is tied with 1 other Texas county for the 3rd fewest bad-air days of the 44 with monitors.
0days unhealthy for everyoneAQI over 150, a year
40AQI on a typical dayGood: fine for everyone
1bad-air day since 2016Too few to show a season
102worst day since 2016May 8, 2024, fine particles
How to read the AQIThe EPA's air score runs from 0 to 500. Higher is worse. Over 100 counts as a bad-air day.
Typical day 40 (Good)Worst day 102 (Unhealthy for sensitive groups)
Good0 to 50Moderate51 to 100Sensitive groups101 to 150Unhealthy151 to 200Very unhealthy201 to 300Hazardous301 to 500
Bad-air days by month in Brazos County
Bad air is rare here: 1 bad-air day in 6 years of daily readings since 2016, too few to show a season. Each tile is the average for that month.
Jan0
Feb0
Mar0
Apr0
May0.2
Jun0
Jul0
Aug0
Sep0
Oct0
Nov0
Dec0
The worst day since 2016 was May 8, 2024: AQI 102, from fine particles.
What causes it
Fine particles are the only pollutant measured here. The only bad-air day since 2016 was a fine-particle day, on May 8, 2024. Monitors here don't measure ozone, so smog days aren't in these counts.
CDC's model estimates about 0.6 days a year with high ozone at the county's worst spot, 2018 to 2022. See the estimates on the map
CDC estimates by month, 2001 to 2022
The CDC's model counts bad-air days at the county's worst spot, from monitors and satellites. Particles (brown) fill the inside of the ring and ozone (blue) the outside.
See the numbers by month
| Month | Fine particles | Ozone |
|---|---|---|
| January | 0 | 0 |
| February | 0 | 0 |
| March | 0 | 0 |
| April | 0 | 0.5 |
| May | 0 | 0.9 |
| June | 0 | 1.2 |
| July | 0 | 0.2 |
| August | 0 | 0.8 |
| September | 0.1 | 1.6 |
| October | 0 | 0.5 |
| November | 0 | 0.1 |
| December | 0 | 0 |
What helps in Brazos County
The air here is clean most days: 1 bad-air day in 6 years of daily readings. Wildfire smoke can still drift in from far away, so it's worth being ready.
Keep a cheap backup
A box fan with a MERV 13 filter clamped to it cleans a room in a pinch.
Build one →Keep one room clean on smoky days
Shut the windows and run an air purifier sized for the room.
Choosing a purifier →For today's reading and tomorrow's forecast, check AirNow by ZIP code. Its fire and smoke map adds smoke plumes.
Smoky days are rare here, so a purifier is optional. If you want one for wildfire season anyway, see the 3 models we'd buy, each with a verified smoke rating.
Every year since 2020
Bad-air days each year. The striped part is days unhealthy for everyone, over AQI 150. The worst recent year was 2024, with 1 bad-air day.
Unhealthy for sensitive groups (101 to 150)Unhealthy or worse (over 150)
See the numbers by year
| Year | Bad-air days | Over 150 |
|---|---|---|
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 0 | 0 |
Brazos County and its neighbors
Bad-air days a year, 2021 to 2025. Texas counties with monitors averaged about 18 bad-air days a year, weighted by population.
Brazos County<1
Nearest counties with a full report: Montgomery County, TX (9 bad-air days a year), Harris County, TX (37 bad-air days a year), Bell County, TX (4 bad-air days a year).
Questions people ask about air in Brazos County
How often is the air bad in Brazos County?
From 2021 to 2025, monitors in Brazos County recorded almost no bad-air days a year with an AQI above 100, which is unhealthy for sensitive groups or worse. The worst year in that stretch was 2024, with 1 bad-air day.
What causes bad air in Brazos County?
The only bad-air day since 2016 was a fine-particle day, on May 8, 2024. Monitors here don't measure ozone, so smog days aren't in these counts.
Where can I see today's air quality in Brazos County?
AirNow, run by the EPA and its partners, shows the current AQI and tomorrow's forecast for your ZIP code. Its fire and smoke map adds smoke plumes. On a typical day the AQI in Brazos County is about 40, which is good, fine for everyone. Bad days are rare here, so check it when wildfire smoke is in the news.
About these numbers
Day counts come from the EPA's county air quality summaries, which take the worst reading across a county's monitors each day. Monitors here reported on about 348 days a year from 2021 to 2025. A county is large, and your street can be cleaner or worse. CDC's model, which estimates every county from monitors and satellites, gives the worst spot in Brazos County almost no high-particle days and about 1 high-ozone day a year from 2018 to 2022.
Sources: EPA AirData county AQI summaries (2000 to 2025) and daily county AQI (2016 to 2025); CDC Environmental Public Health Tracking Network modeled PM2.5 and ozone (2001 to 2022). Updated November 8, 2026.