SmogRank / United States / Washington / Parkland
Parkland, month by month
Parkland has a measured daily mean on 1,300 days since 1 January 2023. Its worst month was January 2025, at 63 US AQI (15.4 µg/m³), 466th of 2,474 cities on that month's world ranking. Its cleanest was March 2026, at 17 US AQI (3.1 µg/m³). 2025 averaged 32 US AQI (5.7 µg/m³), against 32 US AQI (5.7 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 |
|---|---|
| Apr 2026 | 13 of 30 days measured; a month needs 21. The others: 17 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.
Parkland's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2025 | 6315.4 µg/m³ | 466thof 2,474 | Western United States and Mexico, January and February 2025 |
| November 2023 | 5913.3 µg/m³ | 208thof 2,243 | North-western United States and Canada, October and November 2023 |
| January 2026 | 5611.8 µg/m³ | 937thof 2,617 | Washington and Oregon, United States, January 2026 Washington, United States, January 2026 |
| July 2023 | 5310.3 µg/m³ | 631stof 1,432 | Washington, United States, July 2023 |
| August 2023 | 529.5 µg/m³ | 701stof 1,980 | North-western United States and Canada, August 2023 |
| October 2023 | 488.7 µg/m³ | 565thof 2,012 | North-western United States and Canada, October and November 2023 |
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.
Parkland's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Jul 2023 | 219144.0 µg/m³ | Washington, United States, July 2023 |
| 5 Jul 2024 | 18198.1 µg/m³ | – |
| 20 Aug 2023 | 15156.2 µg/m³ | North-western United States and Canada, August 2023 |
| 4 Jul 2023 | 14553.3 µg/m³ | – |
| 5 Aug 2026 | 11842.4 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 6 Aug 2026 | 10938.9 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 25 Jan 2026 | 10436.9 µg/m³ | Washington and Oregon, United States, January 2026 |
| 26 Jan 2026 | 9733.9 µg/m³ | Washington and Oregon, United States, January 2026 |
| 26 Nov 2023 | 9130.8 µg/m³ | – |
| 25 Nov 2023 | 8929.6 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, Parkland, 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/parkland/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.
Parkland now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 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).