Winston-Salem Air Quality in July
Across 2019–2025, Winston-Salem's July air quality had a median AQI of 52 (Moderate) over 217 monitored days in the Winston-Salem, NC area. 1.4% of July days (3 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 66.8% of days. The cleanest July on record here was 2022 (median AQI 48, 0 days above 100) and the worst was 2023 (median 57, 2 days above 100, peak AQI 147).
- Good: 41.9%
- Moderate: 56.7%
- Unhealthy for Sensitive Groups: 1.4%
- 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 July?
Moderate on a typical day: median AQI 52 across 2019–2025, with 1.4% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓41.9% of July days were Good (AQI 0–50), 56.7% Moderate (51–100).
- ✓3 days of 217 reached AQI 101+; the July peak was 147.
- ✓Best July: 2022; worst July: 2023.
Frequently asked questions
What is the air quality like in Winston-Salem in July?▾
Across 2019–2025, the median daily AQI in Winston-Salem in July was 52 (Moderate). 41.9% of days were Good, 56.7% Moderate, and 1.4% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Winston-Salem?▾
A typical July day in Winston-Salem is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of July days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Winston-Salem's July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 66.8% of July days in Winston-Salem. The highest July AQI recorded in 2019–2025 was 147 (Unhealthy for Sensitive Groups), in 2023.
Winston-Salem July air quality, year by year
Winston-Salem July air quality by year (Winston-Salem, NC, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 55 | 0 | 87 | PM2.5 |
| 2020 | 31 | 51 | 0 | 85 | PM2.5 |
| 2021 | 31 | 60 | 1 | 105 | PM2.5 |
| 2022cleanest | 31 | 48 | 0 | 86 | PM2.5 |
| 2023worst | 31 | 57 | 2 | 147 | PM2.5 |
| 2024 | 31 | 51 | 0 | 90 | O3 |
| 2025 | 31 | 51 | 0 | 70 | PM2.5 |
What July air means in Winston-Salem
A typical July day in Winston-Salem is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of July days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
July's median AQI of 52 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 July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Winston-Salem runs above the national July norm; 1.4% of its July days topped AQI 100 versus 3.6% nationally (below average).
July is part of Winston-Salem's summer season (June, July, August); the summer page pools all three months.
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 month 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.