Washington · AirNow reporting area

Seattle-Bellevue-Kent Valley, WA air quality

The Air Quality Index in Seattle-Bellevue-Kent Valley is 25 (Good) as of 1:00 AM PDT on Wed, Oct 28, with Ground-level ozone (O3) as the main pollutant. Today's forecast: AQI 33, Good (PM2.5). Tomorrow: AQI 33, Good (PM2.5). Preliminary data from the EPA AirNow program, reported by Puget Sound Clean Air Agency.

Updated Oct 28, 2026, 4:11 AM EDT (snapshot)

Current AQI

AQI now

25Good

1:00 AM PDT, Wed, Oct 28

By pollutant

Ozone: 25Good
PM2.5: 21Good
PM10: 12Good

Yesterday's highest AQI

24Good

PM2.5, Tue, Oct 27

What this AQI means for your health

Good (AQI 0–50). Air pollution is low and is not expected to affect health. A good day to be active outside.

These are general guidelines based on EPA's AQI categories, written in our own words. See the full AQI scale.

Air quality forecast

Daily AQI forecast issued by Puget Sound Clean Air Agency. Some areas forecast a category without a number.

AQI forecast for Seattle-Bellevue-Kent Valley
Day	Forecast	Pollutants
Today, Wed, Oct 28	33Good	PM2.5 33
Tomorrow, Thu, Oct 29	33Good	PM2.5 33
Fri, Oct 30	33Good	PM2.5 33
Sat, Oct 31	69Moderate	PM2.5 69

Monitor readings

Latest hourly NowCast AQI at 10 monitors assigned to or near this area. NowCast weighs recent hours more heavily so it reacts faster to changes. Distance is from the area's center point.

Monitors for Seattle-Bellevue-Kent Valley (hour starting, local time)
Monitor	Hour	PM2.5 AQI	Ozone AQI	PM10 AQI	PM2.5 µg/m³	Miles
Seattle-Duwamish	12 AM	18	—	12	2.5	0
Seattle-Beacon Hill	12 AM	0	24	7	-1.1	2
Seattle-South Park	12 AM	21	—	—	3.8	2
Seattle-10th & Weller	12 AM	3	—	—	0.1	3
Tukwila_Allentown	12 AM	5	—	—	0	5
SeaTac-Sunset Park	12 AM	13	—	—	2.7	6
Bellevue-SE 12th	12 AM	8	—	—	1.2	9
Kent-S 236th	12 AM	3	—	—	-1	12
Lake Forest Park-Town Center	12 AM	13	—	—	2.1	14
Auburn 29th St	12 AM	13	—	—	2	20

Last 12 hours

Highest hourly NowCast AQI among the monitors above, for each hour (PDT).

Hourly AQI, highest monitor
Hour starting	PM2.5 AQI	Ozone AQI	PM10 AQI	Monitors
12 AM	21	24	12	10
11 PM	23	25	15	10
10 PM	30	23	19	10
9 PM	21	23	16	10
8 PM	21	24	15	10
7 PM	21	24	15	10
6 PM	22	22	15	10
5 PM	24	21	19	10
4 PM	25	21	20	10
3 PM	29	21	17	10
2 PM	22	20	16	10
1 PM	22	18	12	10

Hourly monitor values from AirNow HourlyAQObs files, latest hour Oct 28, 2026, 3:00 AM EDT. Single-hour readings can be missing or revised.

Protecting yourself on bad air days

When the AQI is high, spend less time being active outdoors, keep windows closed if the outdoor air is worse than indoors, and run a portable HEPA air cleaner or your central system with a high-efficiency filter (MERV 13 or higher if your system can handle it). When fine particles or smoke are the problem, a well-fitted N95 respirator gives much better protection than a cloth or surgical mask. Read more on our wildfire smoke page.

Shopping for an air cleaner? Compare air purifiers on OpenPicks, our sister site.

Nearby areas

Kitsap County, WA

9Good

16 miles away

Tacoma-Puyallup, WA

27Good

26 miles away

Cascade foothills of King-Pierce Counties, WA

Today:33Good

27 miles away

Cascades of East King County, WA

6Good

35 miles away

Everett-Marysville-Lynnwood, WA

23Good

38 miles away

Shelton, WA

2Good

43 miles away

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Sources

Current AQI, yesterday's maximum and forecasts: U.S. EPA AirNow reporting area file (files.airnowtech.org), as of Oct 28, 2026, 4:11 AM EDT.
Monitor readings: AirNow HourlyAQObs files (hourly NowCast AQI and raw concentrations).
Reporting agencies: Puget Sound Clean Air Agency; Washington Department of Ecology. These agencies own the data and are the authority for forecasts and advisories.
Values are shown as received from AirNow. See AirNow partners for the full list of agencies.

Preliminary data. AirNow readings and forecasts come from federal, state, local and tribal air quality agencies. They are not fully verified, may change, and must not be used for regulatory or official decisions; official data are in EPA's Air Quality System. For the latest official readings and advisories, check AirNow.gov and your state or local air agency.

This page is general information, not medical advice. If you have symptoms or a health condition, follow your doctor's guidance.