SmogRank / United States / North Carolina / Marvin
Marvin, month by month
Marvin has a measured daily mean on 957 days since 22 July 2023. Its worst month was November 2023, at 55 US AQI (11.5 µg/m³), 358th of 2,243 cities on that month's world ranking. Its cleanest was October 2025, at 18 US AQI (3.3 µg/m³). 2025 averaged 38 US AQI (6.9 µg/m³), against 43 US AQI (7.8 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
8 months
| Month | Why |
|---|---|
| Aug 2026 | 20 of 31 days measured; a month needs 22. The others: 7 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| Mar 2026 | 13 of 31 days measured; a month needs 22. The others: 16 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Jul 2025 | No day measured. The others: 31 with no readings from the monitor. |
| Jun 2025 | 12 of 30 days measured; a month needs 21. The others: 14 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| Dec 2023 | 9 of 31 days measured; a month needs 22. The others: 19 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Sep 2023 | 8 of 30 days measured; a month needs 21. The others: 19 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Aug 2023 | 4 of 31 days measured; a month needs 22. The others: 25 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Jul 2023 | 3 of 31 days measured; a month needs 22. The others: 6 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Marvin's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| November 2023 | 5511.5 µg/m³ | 358thof 2,243 | – |
| February 2024 | 529.7 µg/m³ | 710thof 2,486 | – |
| October 2024 | 509.0 µg/m³ | 634thof 2,020 | – |
| January 2025 | 509.0 µg/m³ | 1,177thof 2,474 | – |
| March 2024 | 498.8 µg/m³ | 621stof 1,698 | Eastern United States, March 2024 |
| March 2025 | 488.7 µg/m³ | 1,833rdof 2,862 | – |
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.
Marvin's worst days
| Day | US AQI | Episode |
|---|---|---|
| 15 Mar 2024 | 8125.1 µg/m³ | Eastern United States, March 2024 |
| 14 Mar 2024 | 7823.8 µg/m³ | Eastern United States, March 2024 |
| 22 Feb 2024 | 7522.0 µg/m³ | – |
| 14 Mar 2025 | 7421.6 µg/m³ | – |
| 21 Mar 2026 | 7421.3 µg/m³ | – |
| 5 Nov 2023 | 7321.1 µg/m³ | – |
| 25 Feb 2026 | 7120.0 µg/m³ | – |
| 13 Mar 2025 | 7119.8 µg/m³ | – |
| 4 Nov 2023 | 7019.3 µg/m³ | – |
| 21 Nov 2025 | 7019.2 µg/m³ | – |
Daily means, the highest since 22 Jul 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, Marvin, United States, 22 Jul 2023 – 9 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/marvin/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.
Marvin now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).