SmogRank / United States / Washington / Kent

Kent, month by month

Kent has a measured daily mean on 406 days since 1 January 2023. Its worst month was August 2026, at 51 US AQI (9.1 µg/m³), 1,155th of 2,896 cities on that month's world ranking. Its cleanest was March 2026, at 14 US AQI (2.6 µg/m³).

Every month since 2023

202627 so far244 days measured2,650th of 2,791 in the world
Jan2 daysFeb24#2,689Mar14#2,942Apr18#2,850May25#2,508Jun26#2,218Jul26#2,635Aug51#1,155Sep31#2,060Oct41#1,250
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)162 days measured
Jan45#695Feb45#814Mar41#582Apr33#1,221May42#1,042Jun17 daysJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Kent'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 Kent marked; each year, the year's. A dashed square is the running month, so far.
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

32 months
MonthWhy
Jan 20262 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
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.
Nov 2024No day measured.
Oct 2024No day measured.
Sep 2024No day measured.
Aug 2024No day measured.
Jul 2024No day measured.
Jun 2024No day measured.
May 2024No day measured.
Apr 2024No day measured.
Mar 2024No day measured.
Feb 2024No day measured.
Jan 2024No day measured.
Dec 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2023No day measured. The others: 1 missing from OpenAQ's archive, 30 with under 18 hours of readings or readings that failed our checks.
Jun 202317 of 30 days measured; a month needs 21. The others: 13 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.

Kent's worst months

MonthUS AQIDays measuredWorld rankEpisode
August 2026 519.1 µg/m³28 of 311,155thof 2,896North-western United States and Canada, 4 to 22 August 2026
January 2023 458.1 µg/m³28 of 31695thof 1,261–
February 2023 458.1 µg/m³25 of 28814thof 1,129–
May 2023 427.5 µg/m³31 of 311,042ndof 1,600–
March 2023 417.3 µg/m³31 of 31582ndof 911–
April 2023 335.9 µg/m³30 of 301,221stof 1,622–

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.

Kent's worst days

DayUS AQIEpisode
5 Aug 2026 11541.1 µg/m³North-western United States and Canada, 4 to 22 August 2026
6 Aug 2026 11139.6 µg/m³North-western United States and Canada, 4 to 22 August 2026
4 Aug 2026 8829.2 µg/m³North-western United States and Canada, 4 to 22 August 2026
7 Aug 2026 7220.6 µg/m³North-western United States and Canada, 4 to 22 August 2026
22 Jul 2026 6818.0 µg/m³–
2 Feb 2023 6516.8 µg/m³–
31 Jan 2023 6516.4 µg/m³–
1 Jan 2023 6416.3 µg/m³–
30 Jan 2023 6114.5 µg/m³–
19 Mar 2023 6114.4 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, Kent, 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/kent/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.

Kent 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).