Williams, South Carolina Air Quality
Williams has a median AQI of 26, earning an air quality grade of A+ — excellent air quality that ranks better than 93% of US cities. Air quality has been improving steadily over the past decade, a positive sign for residents. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2019, Williams recorded 7 good air quality days (100% of monitored days).
Population: 100 • County: Colleton
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Quick Facts
| Current AQI | 28 — Good |
| Air Quality Grade | A+ |
| Median AQI (2019) | 26 |
| vs. U.S. Cities | Better than 93% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | ↑ Improving |
| Data Source | EPA AirNow |
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 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
2019 Air Quality Summary
Primary Pollutant Days (2019)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Williams Air Quality
What is the air quality in Williams today?
The current AQI in Williams is 28, which is rated "Good". Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Williams getting better or worse?
Air quality in Williams has been improving over the past decade. The median AQI dropped from 39 in 2016 to 26 in 2019.
What is the most common air pollutant in Williams?
PM2.5 is the primary air pollutant in Williams, responsible for the most air quality-impacted days in 2019. Particulate matter can originate from vehicle exhaust, wildfires, and industrial emissions.
How many unhealthy air days does Williams have per year?
In 2019, Williams had 0 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 7 good days and 0 moderate days out of 7 days monitored.
What air quality grade does Williams receive?
Williams receives an air quality grade of A+, placing it better than 93% of US cities. This grade is based on a median AQI of 26 for 2019, derived from EPA monitoring data.
Air Quality Grade
Better than 93% of US cities
Nearby Cities
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National Rankings
See how Williams compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Williams
Based on your area's air quality (median AQI: 26), we recommend these air purifiers to help protect your health indoors.
RabbitAir MinusA2
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Other Great Options
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
Dyson Pure Cool TP04
Premium all-in-one air purifier and fan with advanced features.
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