SmogRank / United States / California / Imperial Beach
Imperial Beach, month by month
Imperial Beach has a measured daily mean on 1,093 days since 29 September 2023. Its worst month was December 2024, at 80 US AQI (24.7 µg/m³), 145th of 2,616 cities on that month's world ranking. Its cleanest was July 2025, at 49 US AQI (8.8 µg/m³). 2025 averaged 60 US AQI (13.8 µg/m³), against 59 US AQI (13.5 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
1 month
| Month | Why |
|---|---|
| Sep 2023 | 2 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.
Imperial Beach's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 8024.7 µg/m³ | 145thof 2,616 | South-western United States and Mexico, December 2024 to January 2025 California and Oregon, United States, December 2024 |
| December 2025 | 7421.6 µg/m³ | 455thof 3,006 | Western United States and Mexico, December 2025 |
| January 2025 | 7421.4 µg/m³ | 255thof 2,474 | Western United States and Mexico, January and February 2025 California, United States, January 2025and 1 more |
| December 2023 | 7119.8 µg/m³ | 165thof 2,247 | – |
| November 2025 | 6617.0 µg/m³ | 509thof 2,715 | – |
| November 2024 | 6616.9 µg/m³ | 336thof 2,624 | California, United States, November 2024 |
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.
Imperial Beach's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 Jan 2025 | 15459.3 µg/m³ | South-western United States and Mexico, December 2024 to January 2025 |
| 2 Jan 2025 | 13248.2 µg/m³ | South-western United States and Mexico, December 2024 to January 2025 |
| 6 Dec 2024 | 12545.4 µg/m³ | California and Oregon, United States, December 2024 |
| 25 Jan 2025 | 12344.4 µg/m³ | – |
| 16 Dec 2025 | 11842.3 µg/m³ | Western United States and Mexico, December 2025 |
| 5 Nov 2023 | 11440.6 µg/m³ | – |
| 7 Dec 2024 | 11039.3 µg/m³ | California and Oregon, United States, December 2024 |
| 19 Dec 2025 | 11039.0 µg/m³ | Western United States and Mexico, December 2025 |
| 17 Dec 2024 | 10938.7 µg/m³ | – |
| 12 Dec 2025 | 10737.9 µg/m³ | – |
Daily means, the highest since 29 Sept 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, Imperial Beach, United States, 29 Sep 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/imperial-beach/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.
Imperial Beach 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).