SmogRank / United States / North Carolina / Clayton
Clayton, month by month
Clayton has a measured daily mean on 1,272 days since 1 January 2023. Its worst month was June 2023, at 69 US AQI (19.0 µg/m³), 284th of 1,603 cities on that month's world ranking. Its cleanest was October 2025, at 29 US AQI (5.3 µg/m³). 2025 averaged 42 US AQI (7.5 µg/m³), against 42 US AQI (7.6 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
4 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 1 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Clayton's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 6919.0 µg/m³ | 284thof 1,603 | Eastern United States and Canada, June and July 2023 United States and Canada, June 2023and 1 more |
| July 2023 | 5511.2 µg/m³ | 508thof 1,432 | United States and Canada, July 2023 Eastern United States and Canada, June and July 2023 |
| June 2025 | 529.9 µg/m³ | 1,326thof 2,508 | – |
| July 2026 | 529.6 µg/m³ | 1,469thof 2,784 | – |
| June 2026 | 529.4 µg/m³ | 741stof 2,497 | – |
| May 2023 | 519.3 µg/m³ | 585thof 1,600 | Eastern United States and Canada, May and June 2023 |
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.
Clayton's worst days
| Day | US AQI | Episode |
|---|---|---|
| 18 Jul 2023 | 11541.0 µg/m³ | United States and Canada, July 2023 |
| 9 Jun 2023 | 10235.8 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Jun 2023 | 9734.0 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 30 Jun 2023 | 9029.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 29 Jun 2023 | 8828.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 17 Jun 2023 | 8527.4 µg/m³ | United States and Canada, June 2023 |
| 10 Jun 2023 | 8326.1 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 8 Jun 2023 | 8225.5 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 16 Jun 2023 | 8225.5 µg/m³ | United States and Canada, June 2023 |
| 17 Jul 2023 | 8125.1 µg/m³ | United States and Canada, July 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, Clayton, 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/clayton/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.
Clayton now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 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).