Round Top, Texas Air Quality
Round Top has a median AQI of 34, earning an air quality grade of A — excellent air quality that ranks better than 83% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2018, Round Top recorded 262 good air quality days (79% of monitored days).
Population: 105 • County: Fayette
Current AQI
Quick Facts
| Current AQI | 37 — Good |
| Air Quality Grade | A |
| Median AQI (2018) | 34 |
| vs. U.S. Cities | Better than 83% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Round Top is sourced from the CAPCOG TAYLOR MURPHY PARK C1629 monitoring area, located approximately 56 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Round Top has relatively consistent air quality throughout the year without a strong seasonal peak. Air quality is primarily influenced by local traffic, industrial activity, and regional weather patterns rather than a single seasonal driver.
AQI Trend (10 Years)
Air Quality Days by Year
Round Top Median AQI by Year
Annual EPA air quality data for Round Top — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2018 | 34 | 262 | — | 96 | PM2.5 |
| 2017 | 33 | 303 | — | 84 | PM2.5 |
| 2016 | 34 | 283 | — | 86 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2018 Air Quality Summary
Primary Pollutant Days (2018)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Round Top Air Quality
What is the air quality in Round Top today?
The current AQI in Round Top is 37, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Round Top getting better or worse?
Air quality in Round Top has been stable. The median AQI has remained stable at around 34 over the past decade.
What is the most common air pollutant in Round Top?
PM2.5 is the primary air pollutant in Round Top, responsible for 330 days (100% of monitored days) in 2018. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Round Top have per year?
In 2018, Round Top recorded 79% good air quality days (262 days) out of 330 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 96.
What air quality grade does Round Top receive?
Round Top receives an air quality grade of A, placing it better than 83% of US cities. This is based on a median AQI of 34 in 2018, with 262 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 83% of US cities
Nearby Cities
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National Rankings
See how Round Top compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Round Top
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