SmogRank / United States / North Carolina / Morrisville
Morrisville, month by month
Morrisville has a measured daily mean on 1,375 days since 1 January 2023. Its worst month was June 2023, at 67 US AQI (17.9 µg/m³), 309th of 1,603 cities on that month's world ranking. Its cleanest was October 2025, at 30 US AQI (5.4 µg/m³). 2025 averaged 41 US AQI (7.4 µg/m³), against 44 US AQI (8.0 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
Morrisville's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 6717.9 µg/m³ | 309thof 1,603 | Eastern United States and Canada, June and July 2023 Eastern United States and Canada, May and June 2023 |
| July 2023 | 5813.1 µg/m³ | 275thof 1,432 | United States and Canada, July 2023 Eastern United States and Canada, June and July 2023 |
| August 2024 | 5410.7 µg/m³ | 497thof 2,010 | – |
| August 2023 | 5410.6 µg/m³ | 509thof 1,980 | – |
| July 2026 | 5310.2 µg/m³ | 1,303rdof 2,784 | – |
| March 2026 | 529.9 µg/m³ | 1,692ndof 2,971 | – |
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.
Morrisville's worst days
| Day | US AQI | Episode |
|---|---|---|
| 29 Jun 2023 | 13147.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 18 Jul 2023 | 12344.5 µg/m³ | United States and Canada, July 2023 |
| 30 Jun 2023 | 11340.2 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 9 Jun 2023 | 9934.7 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Jun 2023 | 9733.8 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 17 Jul 2023 | 9231.0 µg/m³ | United States and Canada, July 2023 |
| 15 Mar 2024 | 9130.5 µg/m³ | Eastern United States, March 2024 |
| 21 Oct 2025 | 8728.4 µg/m³ | – |
| 10 Jun 2023 | 8627.8 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 8 Jun 2023 | 8627.7 µg/m³ | Eastern United States and Canada, May and June 2023 |
Daily means, the highest since 1 Jan 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, Morrisville, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/morrisville/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.
Morrisville 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).