SmogRank / United States / Colorado / Arvada
Arvada, month by month
Arvada has a measured daily mean on 762 days since 14 August 2024. Its worst month was August 2026, at 58 US AQI (12.9 µg/m³), 492nd of 2,896 cities on that month's world ranking. Its cleanest was February 2026, at 18 US AQI (3.3 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
2 months
| Month | Why |
|---|---|
| Jan 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 16 of 31 days measured; a month needs 22. The others: 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.
Arvada's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2026 | 5812.9 µg/m³ | 492ndof 2,896 | North-western United States and Canada, July and August 2026 |
| August 2025 | 5511.5 µg/m³ | 894thof 2,901 | – |
| February 2025 | 5410.9 µg/m³ | 1,103rdof 2,633 | – |
| July 2026 | 5310.0 µg/m³ | 1,357thof 2,784 | North-western United States and Canada, July and August 2026 |
| July 2025 | 529.6 µg/m³ | 1,361stof 2,889 | – |
| October 2024 | 468.3 µg/m³ | 754thof 2,020 | – |
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.
Arvada's worst days
| Day | US AQI | Episode |
|---|---|---|
| 4 Aug 2026 | 11139.6 µg/m³ | North-western United States and Canada, July and August 2026 |
| 20 Feb 2025 | 11039.3 µg/m³ | – |
| 3 Aug 2026 | 10236.1 µg/m³ | North-western United States and Canada, July and August 2026 |
| 5 Aug 2026 | 9733.8 µg/m³ | – |
| 7 Aug 2026 | 9432.0 µg/m³ | – |
| 6 Aug 2026 | 9130.6 µg/m³ | – |
| 6 Jul 2026 | 8728.3 µg/m³ | – |
| 7 Jul 2026 | 8426.8 µg/m³ | – |
| 1 Oct 2024 | 8426.7 µg/m³ | – |
| 8 Aug 2026 | 8326.5 µg/m³ | – |
Daily means, the highest since 14 Aug 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, Arvada, United States, 14 Aug 2024 – 11 Oct 2026. Monitor data from AirGradient and Clarity via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/us/arvada/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.
Arvada 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).