SmogRank / United States / California / Santa Clarita
Santa Clarita, month by month
Santa Clarita has a measured daily mean on 1,281 days since 1 January 2023. Its worst month was July 2024, at 61 US AQI (14.4 µg/m³), 205th of 2,566 cities on that month's world ranking. Its cleanest was January 2026, at 28 US AQI (5.0 µg/m³). 2025 averaged 49 US AQI (8.8 µg/m³), against 54 US AQI (10.6 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
2 months
| Month | Why |
|---|---|
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 1 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 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.
Santa Clarita's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2024 | 6114.4 µg/m³ | 205thof 2,566 | California and Nevada, United States, July 2024 |
| June 2024 | 6114.2 µg/m³ | 228thof 2,563 | – |
| July 2023 | 6014.1 µg/m³ | 197thof 1,432 | California, United States, July 2023 |
| May 2024 | 5812.9 µg/m³ | 395thof 2,684 | – |
| October 2024 | 5712.4 µg/m³ | 363rdof 2,020 | – |
| June 2025 | 5712.2 µg/m³ | 774thof 2,508 | – |
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.
Santa Clarita's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jun 2024 | 9230.9 µg/m³ | – |
| 5 Jul 2024 | 8929.3 µg/m³ | California and Nevada, United States, July 2024 |
| 5 Jul 2023 | 8225.5 µg/m³ | California, United States, July 2023 |
| 12 Jul 2024 | 7923.9 µg/m³ | – |
| 4 Dec 2024 | 7722.9 µg/m³ | – |
| 16 Oct 2024 | 7622.6 µg/m³ | – |
| 20 Dec 2025 | 7421.2 µg/m³ | – |
| 23 Sept 2023 | 7321.0 µg/m³ | – |
| 4 Jul 2024 | 7320.8 µg/m³ | California and Nevada, United States, July 2024 |
| 22 Apr 2024 | 7220.5 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, Santa Clarita, 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/santa-clarita/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.
Santa Clarita 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).