SmogRank / United States / Washington / Enumclaw

Enumclaw, month by month

Enumclaw has a measured daily mean on 458 days since 1 January 2023. Its worst month was August 2023, at 48 US AQI (8.7 µg/m³), 844th of 1,980 cities on that month's world ranking. Its cleanest was January 2024, at 2 US AQI (0.4 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnone
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)166 days measured
Jan2#2,385Feb3#2,486Mar4#1,698Apr5#2,518May5#2,682Jun20 daysJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202316 for the year292 days measured1,351st of 1,355 in the world
Jan6#1,261Feb1 dayMar11 daysApr8#1,619May16#1,583Jun13#1,590Jul14#1,408Aug48#844Sep14#2,164Oct16#1,985Nov11#2,232Dec3#2,247
Each square is a month's mean PM2.5 in US AQI from Enumclaw's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Enumclaw marked; each year, the year's.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

31 months
MonthWhy
Oct 2026No day measured.
Sep 2026No day measured.
Aug 2026No day measured.
Jul 2026No day measured.
Jun 2026No day measured.
May 2026No day measured.
Apr 2026No day measured.
Mar 2026No day measured.
Feb 2026No day measured.
Jan 2026No day measured.
Dec 2025No day measured.
Nov 2025No day measured.
Oct 2025No day measured.
Sep 2025No day measured.
Aug 2025No day measured.
Jul 2025No day measured.
Jun 2025No day measured.
May 2025No day measured.
Apr 2025No day measured.
Mar 2025No day measured.
Feb 2025No day measured.
Jan 2025No day measured.
Dec 2024No day measured. The others: 31 with no readings from the monitor.
Nov 2024No day measured. The others: 30 with no readings from the monitor.
Oct 2024No day measured. The others: 31 with no readings from the monitor.
Sep 2024No day measured. The others: 30 with no readings from the monitor.
Aug 2024No day measured. The others: 31 with no readings from the monitor.
Jul 2024No day measured. The others: 31 with no readings from the monitor.
Jun 202420 of 30 days measured; a month needs 21. The others: 5 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours).
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20231 of 28 days measured; a month needs 20. The others: 2 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Enumclaw's worst months

MonthUS AQIDays measuredWorld rankEpisode
August 2023 488.7 µg/m³31 of 31844thof 1,980North-western United States and Canada, August 2023
October 2023 162.9 µg/m³31 of 311,985thof 2,012–
May 2023 162.8 µg/m³28 of 311,583rdof 1,600–
July 2023 142.6 µg/m³30 of 311,408thof 1,432–
September 2023 142.6 µg/m³30 of 302,164thof 2,176–
June 2023 132.3 µg/m³27 of 301,590thof 1,603–

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.

Enumclaw's worst days

DayUS AQIEpisode
20 Aug 2023 14252.0 µg/m³North-western United States and Canada, August 2023
21 Aug 2023 13147.7 µg/m³North-western United States and Canada, August 2023
27 Aug 2023 7522.2 µg/m³North-western United States and Canada, August 2023
26 Aug 2023 6617.3 µg/m³North-western United States and Canada, August 2023
28 Aug 2023 6315.5 µg/m³North-western United States and Canada, August 2023
25 Aug 2023 6214.9 µg/m³North-western United States and Canada, August 2023
24 Aug 2023 5712.3 µg/m³North-western United States and Canada, August 2023
9 Aug 2023 5310.1 µg/m³–
30 Oct 2023 529.6 µg/m³–
1 Sept 2023 529.4 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, Enumclaw, 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/enumclaw/history (accessed 12 Oct 2026).

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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.

Enumclaw now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 17:07 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).