SmogRank / United States / California / Florin
Florin, month by month
Florin has a measured daily mean on 623 days since 26 April 2024. Its worst month was December 2024, at 74 US AQI (21.7 µg/m³), 206th of 2,616 cities on that month's world ranking. Its cleanest was May 2024, at 10 US AQI (1.8 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
10 months
| Month | Why |
|---|---|
| Aug 2026 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 6 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 5 of 30 days measured; a month needs 21. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Florin's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 7421.7 µg/m³ | 206thof 2,616 | California, United States, December 2024 California and Oregon, United States, December 2024 |
| January 2026 | 7119.6 µg/m³ | 450thof 2,617 | California, United States, 30 January to 6 February 2026 California and Oregon, United States, January 2026 |
| December 2025 | 6215.0 µg/m³ | 731stof 3,006 | – |
| November 2025 | 5511.2 µg/m³ | 848thof 2,715 | – |
| February 2026 | 5511.2 µg/m³ | 1,152ndof 2,866 | California, United States, 30 January to 6 February 2026 |
| November 2024 | 5410.6 µg/m³ | 752ndof 2,624 | – |
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.
Florin's worst days
| Day | US AQI | Episode |
|---|---|---|
| 7 Dec 2024 | 12244.1 µg/m³ | California and Oregon, United States, December 2024 |
| 11 Dec 2024 | 10737.8 µg/m³ | California and Oregon, United States, December 2024 |
| 17 Jan 2026 | 9934.7 µg/m³ | California and Oregon, United States, January 2026 |
| 6 Dec 2024 | 9734.0 µg/m³ | California and Oregon, United States, December 2024 |
| 21 Dec 2024 | 9633.2 µg/m³ | California, United States, December 2024 |
| 30 Nov 2024 | 9532.8 µg/m³ | – |
| 1 Dec 2024 | 9532.5 µg/m³ | California and Oregon, United States, December 2024 |
| 2 Dec 2024 | 9532.5 µg/m³ | California and Oregon, United States, December 2024 |
| 16 Jan 2026 | 9432.3 µg/m³ | California and Oregon, United States, January 2026 |
| 15 Jan 2026 | 9432.0 µg/m³ | California and Oregon, United States, January 2026 |
Daily means, the highest since 26 Apr 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, Florin, United States, 26 Apr 2024 – 11 Oct 2026. Monitor data from Clarity via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/us/florin/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.
Florin now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).