Winston-Salem Air Quality in Spring
Across 2019–2025, Winston-Salem's spring (March–May) air quality had a median AQI of 49 (Good) over 644 monitored days in the Winston-Salem, NC area. 0.3% of spring days (2 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 55.9% of days. The cleanest spring on record here was 2020 (median AQI 44, 0 days above 100) and the worst was 2023 (median 53, 1 day above 100, peak AQI 105).
- Good: 53.1%
- Moderate: 46.6%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
Extra Protection for Winston-Salem Homes
Air quality in Winston-Salem 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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How is the air in Winston-Salem in spring?
Good on a typical day: median AQI 49 across 2019–2025, with 0.3% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓53.1% of spring days were Good (AQI 0–50), 46.6% Moderate (51–100).
- ✓2 days of 644 reached AQI 101+; the spring peak was 111.
- ✓Cleanest month: May; worst month: April.
Frequently asked questions
What is the air quality like in Winston-Salem in spring?▾
Across 2019–2025, the median daily AQI in Winston-Salem in spring was 49 (Good). 53.1% of days were Good, 46.6% Moderate, and 0.3% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Winston-Salem?▾
A typical spring day in Winston-Salem sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Winston-Salem's spring air quality problems?▾
Ground-level ozone set the daily AQI on 55.9% of spring days in Winston-Salem. The highest spring AQI recorded in 2019–2025 was 111 (Unhealthy for Sensitive Groups), in 2023.
Winston-Salem spring air quality, year by year
Winston-Salem spring air quality by year (Winston-Salem, NC, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 53 | 0 | 84 | PM2.5 |
| 2020cleanest | 92 | 44 | 0 | 67 | O3 |
| 2021 | 92 | 49 | 0 | 87 | O3 |
| 2022 | 92 | 49 | 0 | 90 | O3 |
| 2023worst | 92 | 53 | 1 | 105 | O3 |
| 2024 | 92 | 49 | 1 | 111 | O3 |
| 2025 | 92 | 51 | 0 | 90 | O3 |
What spring air means in Winston-Salem
A typical spring day in Winston-Salem sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Spring's median AQI of 49 is in line with Winston-Salem's whole-year median of 50, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Winston-Salem runs above the national Spring norm; 0.3% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, May is the cleanest month (median AQI 50, 0.0% of days above 100) and April the worst (median 51, 0.5% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Winston-Salem
The latest EPA AirNow observation puts Winston-Salem's AQI at 52 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Winston-Salem air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Winston-Salem, 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.