Texas · County air quality · 2025
Cameron County, Texas
Median AQI 57 (Moderate). 29.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 57
- Median AQI
- 29.9%
- Good-air days
- 0
- Unhealthy days
- 1%
- Cleaner than US counties
Cameron County's 2025 annual median AQI is 57 (Moderate), with 29.9% Good days
According to the U.S. EPA Air Quality System, Cameron County, Texas posted a 2025 median AQI of 57 (Moderate) across 365 monitored days, with 29.9% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Cameron County's 29.9% Good-day share places it cleaner than 1% of US counties in 2025.
- Closest median-AQI peer
- Kings County (34.5% Good, median AQI 57) is the closest nationwide median-AQI peer to Cameron County.
- 2020–2025 trend
- Cameron County's floor-qualifying Good-day share is worsening from 2020 to 2025 (43.2% → 29.9%).
- Median AQI
- Median AQI: 57
According to the 2025 EPA AQS county release on PlainAirData, Cameron County, Texas ranks #934 of 951 by median AQI (57) and #937 by good-day share (29.9%). Ponce County, Puerto Rico is #1 of 951 by median AQI (3, 91.4% Good days) at good-day-share #159 ≠ largest of 7 at 100.0% Good days #1 by good-day share (100.0%, median AQI 9) at median-AQI #7.
Annual release change
What changed in the 2025 EPA annual release
- Cameron County's Unhealthy-category days fell from 13 to 0 between the 2024 and 2025 EPA annual releases, a change of -13 days.
- Cameron County's peak single-day AQI fell from 171 to 139 between the 2024 and 2025 EPA annual releases, a change of -32 points.
- Cameron County's Good-day share rose from 27.0% to 29.9% between the 2024 and 2025 EPA annual releases, a change of +2.8 percentage points.
- Cameron County's median AQI fell from 61 to 57 between the 2024 and 2025 EPA annual releases, a change of -4 points.
Data updated August 2026
- Good · 109 d · 29.9%
- Moderate · 248 d · 67.9%
- USG · 8 d · 2.2%
How did Cameron County's air break down in 2025?
Across 365 monitored days, 109 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 139 (USG).
EPA AQS →Share of monitored days at AQI 0-50 (Good band).
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
Where Cameron County sits nationally
COUNT-derived placement among 951 US counties with at least 100 monitored days in 2025. Cameron County's Good-day share is 29.9% - cleaner than 1% of that comparison set.
Cameron County Good-day share vs. every US county
Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release
29.9% 1st percentile higher than 1% of 951 US counties
Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Cameron County.
- PM2.5 · 315 days · 86.3%
- Ozone · 50 days · 13.7%
2024 daily-monitor rhythm in Cameron County
Month-by-month median AQI from EPA day-level county monitors (366 reported days in 2024). May posted the highest typical readings (median AQI 124, peak 171); Sep was cleanest at median 45. 13 days crossed Unhealthy (AQI >150) at least once that year.
Five-year seasonal record
EPA day-level county files · 2020–20241,827 daily readings show a recurring local pattern: May has the highest matched-month median AQI (70), while Nov is lowest (43). Each cell is that month’s median daily AQI, not a current-air forecast.
Lower AQI is better. The colors summarize EPA AQI bands; gaps mean the county had no day-level record for that month.
Health Impact Assessment
Cameron County's air quality is rated Poor based on 29.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 29.9% of monitored days in 2025, with a median AQI of 57. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 315 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Cameron County. Highest Good-day share: 2022 (52.3%, 191 of 365 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 158 | 199 | 6 | 3 | 52 | 184 |
| 2021 | 162 | 203 | 0 | 0 | 52 | 99 |
| 2022 | 191 | 171 | 3 | 0 | 48 | 120 |
| 2023 | 161 | 198 | 6 | 0 | 54 | 141 |
| 2024 | 99 | 206 | 48 | 13 | 61 | 171 |
| 2025 | 109 | 248 | 8 | 0 | 57 | 139 |
How does Cameron County compare?
How Cameron County compares
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Cameron County, Texas · 2020–2025
Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.
Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.