SmogRank / United States / California / El Centro
El Centro, month by month
El Centro has a measured daily mean on 1,234 days since 1 January 2023. Its worst month was July 2023, at 60 US AQI (14.0 µg/m³), 204th of 1,432 cities on that month's world ranking. Its cleanest was March 2025, at 21 US AQI (3.7 µg/m³). 2025 averaged 36 US AQI (6.4 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
Months without a mean, and why
4 months
| Month | Why |
|---|---|
| Jun 2023 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | No day measured. The others: 3 missing from OpenAQ's archive, 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 6 of 31 days measured; a month needs 22. The others: 14 missing from OpenAQ's archive, 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.
El Centro's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2023 | 6014.0 µg/m³ | 204thof 1,432 | California, United States, July 2023 |
| July 2024 | 5712.1 µg/m³ | 417thof 2,566 | – |
| August 2025 | 5511.4 µg/m³ | 909thof 2,901 | California and Nevada, United States, August 2025 |
| June 2024 | 5511.3 µg/m³ | 435thof 2,563 | – |
| September 2023 | 529.7 µg/m³ | 649thof 2,176 | – |
| June 2026 | 529.7 µg/m³ | 699thof 2,497 | – |
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.
El Centro's worst days
| Day | US AQI | Episode |
|---|---|---|
| 23 Jul 2023 | 11842.3 µg/m³ | – |
| 5 Aug 2025 | 8728.2 µg/m³ | California and Nevada, United States, August 2025 |
| 5 Jul 2023 | 8326.2 µg/m³ | California, United States, July 2023 |
| 12 Jan 2024 | 7823.6 µg/m³ | – |
| 4 Aug 2025 | 7622.3 µg/m³ | California and Nevada, United States, August 2025 |
| 17 Jan 2024 | 7522.0 µg/m³ | – |
| 6 Sept 2024 | 7521.8 µg/m³ | – |
| 26 Nov 2024 | 7119.9 µg/m³ | – |
| 1 Sept 2023 | 7019.5 µg/m³ | – |
| 17 May 2025 | 7019.5 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, El Centro, United States, 1 Jan 2023 – 10 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/el-centro/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.
El Centro 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).