Williamsburg, Colorado Air Quality
Williamsburg has a median AQI of 25, earning an air quality grade of A+ — excellent air quality that ranks better than 91% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Williamsburg recorded 246 good air quality days (91% of monitored days).
Population: 770 • County: Fremont
Current AQI
Quick Facts
| Current AQI | 10 — Good |
| Air Quality Grade | A+ |
| Median AQI (2025) | 25 |
| vs. U.S. Cities | Better than 91% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | ↓ Worsening |
| 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 Williamsburg is sourced from the Canon City monitoring area, located approximately 6 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Wildfire smoke is a significant factor in Williamsburg's air quality, with regional fires capable of pushing AQI from Good to Unhealthy within hours during fire season (typically July through October). On smoke-impacted days, staying indoors with windows closed and running an air purifier with a HEPA filter is the most effective protection.
AQI Trend (10 Years)
Air Quality Days by Year
Williamsburg Median AQI by Year
Annual EPA air quality data for Williamsburg — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 25 | 246 | — | 77 | PM2.5 |
| 2024 | 13 | 354 | — | 59 | PM10 |
| 2023 | 12 | 162 | — | 71 | PM10 |
| 2022 | 12 | 115 | — | 77 | PM10 |
| 2021 | 15 | 85 | — | 62 | PM10 |
| 2020 | 11 | 17 | — | 27 | PM10 |
| 2019 | 13 | 32 | — | 29 | PM10 |
| 2018 | 15 | 20 | — | 36 | PM10 |
| 2017 | 11 | 39 | — | 44 | PM10 |
| 2016 | 14 | 52 | — | 50 | PM10 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Williamsburg Air Quality
What is the air quality in Williamsburg today?
The current AQI in Williamsburg is 10, 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 Williamsburg getting better or worse?
Air quality in Williamsburg has been worsening. The median AQI has risen 11 points (from 14 in 2016 to 25 in 2025), a concern for local health officials.
What is the most common air pollutant in Williamsburg?
PM2.5 is the primary air pollutant in Williamsburg, responsible for 206 days (76% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Williamsburg have per year?
In 2025, Williamsburg recorded 91% good air quality days (246 days) out of 270 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 77.
What air quality grade does Williamsburg receive?
Williamsburg receives an air quality grade of A+, placing it better than 91% of US cities. This is based on a median AQI of 25 in 2025, with 246 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 91% of US cities
Nearby Cities
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National Rankings
See how Williamsburg compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Williamsburg
Williamsburg faces elevated PM2.5 from wildfire smoke in addition to year-round traffic and industrial sources. We prioritize True HEPA units with high smoke CADR — essential for rapid air cleaning during smoke events.
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