Greensboro Best & Worst AQI Days: Air Quality Guide
The worst air quality day on record for Greensboro (Greensboro-High Point, NC area) was June 29, 2023, when the daily AQI reached 131 (Unhealthy for Sensitive Groups), set by fine particulate matter (PM2.5), in wildfire smoke season. Across 2,557 monitored days in 2019–2025, 0 of the 10 worst days were Unhealthy (AQI 151+) or worse; 5 of the 10 were driven by ground-level ozone and 5 by fine particulate matter (PM2.5), and 5 of them fell in 2023. The cleanest day was January 29, 2024 at AQI 1 (Good); the 10 best days span 3 different years.
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.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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When were Greensboro's worst and best air quality days?
Worst: June 29, 2023, AQI 131 (Unhealthy for Sensitive Groups, PM2.5). Best: January 29, 2024, AQI 1 (Good). Based on 2,557 EPA-monitored days in the Greensboro-High Point, NC area, 2019–2025.
- ✓0 of the 10 worst days were Unhealthy (AQI 151+) or worse; the 10th-worst was AQI 96 (Moderate).
- ✓Ground-level ozone drove 5 of the 10 worst days.
- ✓2023 accounts for 5 of the 10 worst days.
Frequently asked questions
What was the worst air quality day in Greensboro?▾
June 29, 2023: the Greensboro-High Point, NC area's daily AQI hit 131 (Unhealthy for Sensitive Groups), driven by fine particulate matter (PM2.5), in wildfire smoke season. That is the highest of 2,557 monitored days in 2019–2025.
What was the best air quality day in Greensboro?▾
January 29, 2024, with a daily AQI of 1 (Good). The daily AQI is the highest reading from any monitor in the area, so even the cleanest day reflects the area's worst monitor.
What was Greensboro's worst air quality day in 2025?▾
June 12, 2025, AQI 77 (Moderate), set by ground-level ozone, in peak ozone season.
Which pollutant causes Greensboro's worst air days?▾
Ground-level ozone set the AQI on 5 of the 10 worst days; fine particulate matter (PM2.5) on 5. The tables above list the defining pollutant for every day.
Greensboro's 10 worst air quality days, 2019–2025
Highest daily AQI recorded for the Greensboro-High Point, NC area (EPA AQS). The daily AQI is the highest reading from any monitor in the area that day.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2023 page) | 131 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 2 | (2024 page) | 122 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 3 | (2023 page) | 122 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
| 4 | (2023 page) | 113 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 5 | (2023 page) | 112 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 6 | (2024 page) | 100 | Moderate | O3 — ground-level ozone, in peak ozone season |
| 7 | (2024 page) | 100 | Moderate | O3 — ground-level ozone, in peak ozone season |
| 8 | (2021 page) | 100 | Moderate | O3 — ground-level ozone, in peak ozone season |
| 9 | (2023 page) | 97 | Moderate | PM2.5 — fine particulate matter (PM2.5) |
| 10 | (2021 page) | 96 | Moderate | PM2.5 — fine particulate matter (PM2.5) |
Worst day of each year in Greensboro
The single highest-AQI day in each year on record. Click a year for its full month-by-month statistics.
| Year | Worst day | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 2019 | 90 | Moderate | O3 — ground-level ozone, in peak ozone season | |
| 2020 | 88 | Moderate | PM2.5 — fine particulate matter (PM2.5) | |
| 2021 | 100 | Moderate | O3 — ground-level ozone, in peak ozone season | |
| 2022 | 84 | Moderate | O3 — ground-level ozone, in peak ozone season | |
| 2023 | 131 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2024 | 122 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2025 | 77 | Moderate | O3 — ground-level ozone, in peak ozone season |
Greensboro's 10 best air quality days, 2019–2025
Lowest daily AQI recorded for the Greensboro-High Point, NC area. Ties are listed most recent first.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2024 page) | 1 | Good | PM10 — coarse dust (PM10) |
| 2 | (2021 page) | 3 | Good | PM10 — coarse dust (PM10) |
| 3 | (2020 page) | 3 | Good | PM10 — coarse dust (PM10) |
| 4 | (2020 page) | 3 | Good | PM10 — coarse dust (PM10) |
| 5 | (2020 page) | 3 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 6 | (2020 page) | 3 | Good | PM10 — coarse dust (PM10) |
| 7 | (2020 page) | 4 | Good | PM10 — coarse dust (PM10) |
| 8 | (2024 page) | 5 | Good | PM10 — coarse dust (PM10) |
| 9 | (2021 page) | 5 | Good | PM10 — coarse dust (PM10) |
| 10 | (2020 page) | 5 | Good | PM2.5 — fine particulate matter (PM2.5) |
Right now in Greensboro
The latest EPA AirNow observation puts Greensboro's AQI at 52 (PM2.5). The days above are historical records, 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.