SmogRank / Huntington Beach / Mission Viejo
Huntington Beach vs Mission Viejo: PM2.5 compared
Over the last year, Huntington Beach's air was 19% more polluted than Mission Viejo's: PM2.5 averaged 10.8 µg/m³ against 9.1, on the 311 days both cities were measured. Huntington Beach had the dirtier air on 127 of those days, Mission Viejo on 181. Huntington Beach was over the WHO's daily guideline of 15 µg/m³ on 66 of them, Mission Viejo on 17.
Right now
The last year, day by day
Month by month
Year by year
| Year | Huntington Beach | Mission Viejo | Days Huntington Beach was worse |
|---|---|---|---|
| 2026 so far | 48 | 50 | 90 |
| 2025 | 82 | 53 | 37 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Huntington Beach
- 13 Dec 202513951.1 µg/m³
- 21 Jan 202613950.9 µg/m³
- 17 Dec 202513348.6 µg/m³
Mission Viejo
- 17 May 20268024.5 µg/m³
- 14 Dec 20257421.6 µg/m³
- 22 Dec 20257220.5 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Huntington Beach
Side by side with Anaheim (the nearest), Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).
Mission Viejo
Side by side with Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Huntington Beach and Mission Viejo, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/us-huntington-beach/us-mission-viejo (accessed 9 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.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-09 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).