SmogRank / United States / New Mexico / North Valley
North Valley, month by month
North Valley has a measured daily mean on 1,302 days since 1 January 2023. Its worst month was December 2024, at 51 US AQI (9.3 µg/m³), 1,004th of 2,616 cities on that month's world ranking. Its cleanest was March 2024, at 18 US AQI (3.3 µg/m³). 2025 averaged 31 US AQI (5.5 µg/m³), against 31 US AQI (5.5 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 2023 | 10 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
North Valley's worst months
| Month | US AQI | World rank |
|---|---|---|
| December 2024 | 519.3 µg/m³ | 1,004thof 2,616 |
| October 2024 | 437.8 µg/m³ | 860thof 2,020 |
| January 2025 | 407.2 µg/m³ | 1,640thof 2,474 |
| December 2023 | 397.0 µg/m³ | 1,545thof 2,247 |
| November 2024 | 386.8 µg/m³ | 1,755thof 2,624 |
| January 2023 | 376.7 µg/m³ | 893rdof 1,261 |
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.
North Valley's worst days
| Day | US AQI |
|---|---|
| 31 May 2025 | 7320.7 µg/m³ |
| 18 Mar 2025 | 7019.5 µg/m³ |
| 27 Sept 2024 | 6918.9 µg/m³ |
| 1 Jan 2026 | 6416.0 µg/m³ |
| 23 Nov 2024 | 6315.7 µg/m³ |
| 16 Jul 2025 | 6315.7 µg/m³ |
| 31 Dec 2023 | 6215.2 µg/m³ |
| 1 Jan 2023 | 6215.0 µg/m³ |
| 20 May 2023 | 6114.6 µg/m³ |
| 24 Jul 2024 | 6114.6 µg/m³ |
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, North Valley, 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/north-valley/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.
North Valley 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).