SmogRank / United States / Oregon / Tigard
Tigard, month by month
Tigard has a measured daily mean on 1,345 days since 1 January 2023. Its worst month was August 2026, at 57 US AQI (12.3 µg/m³), 531st of 2,896 cities on that month's world ranking. Its cleanest was April 2024, at 21 US AQI (3.8 µg/m³). 2025 averaged 33 US AQI (5.9 µg/m³), against 32 US AQI (5.8 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
Tigard's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2026 | 5712.3 µg/m³ | 531stof 2,896 | North-western United States and Canada, 4 to 22 August 2026 |
| August 2023 | 5310.3 µg/m³ | 573rdof 1,980 | North-western United States and Canada, August 2023 |
| November 2023 | 5310.1 µg/m³ | 600thof 2,243 | – |
| November 2024 | 529.4 µg/m³ | 974thof 2,624 | North-western United States and Canada, November 2024 |
| January 2025 | 519.2 µg/m³ | 1,141stof 2,474 | – |
| October 2023 | 488.6 µg/m³ | 589thof 2,012 | – |
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.
Tigard's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Aug 2026 | 15459.5 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 4 Aug 2026 | 13047.2 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 6 Aug 2026 | 12545.3 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 20 Aug 2023 | 11340.3 µg/m³ | North-western United States and Canada, August 2023 |
| 9 Nov 2024 | 10436.9 µg/m³ | North-western United States and Canada, November 2024 |
| 10 Nov 2024 | 9331.5 µg/m³ | North-western United States and Canada, November 2024 |
| 6 Sept 2024 | 8929.5 µg/m³ | North-western United States and Canada, 4 to 11 September 2024 |
| 31 Aug 2026 | 8527.4 µg/m³ | – |
| 2 Feb 2023 | 8527.2 µg/m³ | – |
| 30 Jan 2025 | 7924.2 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, Tigard, 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/tigard/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.
Tigard now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).