SmogRank / United States / California / Martinez
Martinez, month by month
Martinez has a measured daily mean on 648 days since 16 July 2024. Its worst month was December 2024, at 58 US AQI (12.9 µg/m³), 605th of 2,616 cities on that month's world ranking. Its cleanest was April 2026, at 12 US AQI (2.1 µg/m³).
Every month since 2024
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
7 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor. |
| Sep 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 15 of 31 days measured; a month needs 22. The others: 1 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.
Martinez's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 5812.9 µg/m³ | 605thof 2,616 | California and Oregon, United States, December 2024 |
| January 2025 | 5310.0 µg/m³ | 999thof 2,474 | – |
| November 2025 | 498.8 µg/m³ | 1,302ndof 2,715 | – |
| January 2026 | 458.1 µg/m³ | 1,462ndof 2,617 | – |
| December 2025 | 448.0 µg/m³ | 1,837thof 3,006 | – |
| August 2024 | 447.9 µg/m³ | 1,276thof 2,010 | – |
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.
Martinez's worst days
| Day | US AQI | Episode |
|---|---|---|
| 7 Dec 2024 | 10537.1 µg/m³ | California and Oregon, United States, December 2024 |
| 22 Apr 2025 | 9633.1 µg/m³ | – |
| 11 Dec 2024 | 9231.0 µg/m³ | California and Oregon, United States, December 2024 |
| 10 Dec 2024 | 8024.7 µg/m³ | California and Oregon, United States, December 2024 |
| 8 Dec 2024 | 7723.0 µg/m³ | California and Oregon, United States, December 2024 |
| 30 Nov 2024 | 7421.3 µg/m³ | – |
| 20 Dec 2024 | 7320.8 µg/m³ | – |
| 21 Dec 2024 | 7120.0 µg/m³ | – |
| 6 Dec 2025 | 6919.0 µg/m³ | – |
| 4 Dec 2025 | 6918.9 µg/m³ | – |
Daily means, the highest since 16 Jul 2024; 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, Martinez, United States, 16 Jul 2024 – 23 Jun 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/martinez/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.
Martinez now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).