SmogRank / United States / Virginia / Harrisonburg
Harrisonburg, month by month
Harrisonburg has a measured daily mean on 1,030 days since 17 November 2023. Its worst month was July 2026, at 58 US AQI (12.7 µg/m³), 775th of 2,784 cities on that month's world ranking. Its cleanest was October 2025, at 24 US AQI (4.4 µg/m³). 2025 averaged 38 US AQI (6.8 µg/m³), against 39 US AQI (7.0 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Mar 2026 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 14 of 30 days measured; a month needs 21. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Harrisonburg's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 5812.7 µg/m³ | 775thof 2,784 | Northern United States and Canada, July 2026 |
| February 2026 | 529.7 µg/m³ | 1,482ndof 2,866 | – |
| December 2023 | 509.0 µg/m³ | 952ndof 2,247 | – |
| June 2025 | 498.9 µg/m³ | 1,627thof 2,508 | – |
| August 2024 | 498.8 µg/m³ | 929thof 2,010 | – |
| February 2024 | 478.4 µg/m³ | 991stof 2,486 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Harrisonburg's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Nov 2023 | 16879.8 µg/m³ | – |
| 17 Jul 2026 | 12043.4 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Jul 2026 | 10436.9 µg/m³ | Northern United States and Canada, July 2026 |
| 21 Mar 2024 | 8225.7 µg/m³ | – |
| 20 Jul 2026 | 8225.5 µg/m³ | Northern United States and Canada, July 2026 |
| 7 Aug 2025 | 8024.4 µg/m³ | – |
| 25 Dec 2023 | 7924.3 µg/m³ | – |
| 26 Dec 2024 | 7522.2 µg/m³ | – |
| 12 Jun 2025 | 7421.3 µg/m³ | – |
| 8 Aug 2025 | 7321.0 µg/m³ | – |
Daily means, the highest since 17 Nov 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Harrisonburg, United States, 17 Nov 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/harrisonburg/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Harrisonburg now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).