Greensboro Air Quality in 2021
In 2021, Greensboro's air quality (Greensboro-High Point, NC area) had a median daily AQI of 44 (Good) across 365 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 241 were Good, and the year's peak AQI was 100 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 201 of those days. The cleanest month of 2021 was February (median AQI 23, 0 days above 100) and the worst was July (median 60, 0 days above 100, peak 96).
- Good: 66.0%
- Moderate: 34.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for Greensboro Homes
Air quality in Greensboro is moderate (AQI 52), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
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How was Greensboro's air quality in 2021?
Good on a typical day: median AQI 44, with 0 days above AQI 100 out of 365 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2021: 100 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 201 days.
- ✓Cleanest month: February; worst: July.
Frequently asked questions
What was the average AQI in Greensboro in 2021?▾
EPA's Air Quality System puts Greensboro's (Greensboro-High Point, NC) median daily AQI for 2021 at 44, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 100.
Which month had the worst air quality in Greensboro in 2021?▾
The cleanest month of 2021 was February (median AQI 23, 0 days above 100) and the worst was July (median 60, 0 days above 100, peak 96).
Was 2021 a good or bad year for Greensboro's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 4th cleanest by days above AQI 100. 2021's median of 44 is in line with the area's typical annual median of 44.
Greensboro month by month in 2021
Greensboro air quality month by month, 2021 (Greensboro-High Point, NC, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 29 | 0 | 60 | PM2.5 |
| Februarycleanest | 28 | 23 | 0 | 53 | PM2.5 |
| March | 31 | 44 | 0 | 90 | O3 |
| April | 30 | 51 | 0 | 90 | O3 |
| May | 31 | 49 | 0 | 80 | O3 |
| June | 30 | 42 | 0 | 100 | O3 |
| Julyworst | 31 | 60 | 0 | 96 | PM2.5 |
| August | 31 | 55 | 0 | 80 | PM2.5 |
| September | 30 | 47 | 0 | 61 | O3 |
| October | 31 | 41 | 0 | 57 | PM2.5 |
| November | 30 | 47 | 0 | 67 | PM2.5 |
| December | 31 | 50 | 0 | 61 | PM2.5 |
How 2021 compares
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 4th cleanest by days above AQI 100.
2021's median of 44 is in line with the area's typical annual median of 44.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Greensboro
The latest EPA AirNow observation puts Greensboro's AQI at 52 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Greensboro air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Greensboro-High Point, NC), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.