Mountlake Terrace, WA Air Quality Today
Saturday, October 17, 2026 · Data: WeatherAPI • EPA
Air quality in Mountlake Terrace is Moderate today, October 17. Fine particles (PM2.5) are doing most of the work at 26 µg/m³. Most people can carry on as usual, though anyone sensitive to ozone or smoke should get long outdoor efforts done in the morning.
Level 2 of 6 on the EPA scale
What's in Mountlake Terrace's Air Right Now
PM2.5 (fine particles): 26 µg/m³. Readings between 12 and 35 µg/m³ rate Moderate. Sensitive lungs may notice on longer outings. These particles come from exhaust and smoke and are small enough to reach deep into your lungs.
PM10 (coarse dust): 26 µg/m³. Readings under 54 µg/m³ rate Good. Dust and pollen fragments ride in this size range and irritate your nose and throat.
Ozone: 3 µg/m³. Ozone forms when sunlight cooks car exhaust, so hot afternoons read worst, usually between 2 PM and 7 PM. Mornings stay cleanest.
Nitrogen dioxide: 67.4 µg/m³. NO2 comes almost entirely from traffic and feeds afternoon ozone. Readings run highest near busy roads during the morning and evening commutes.
Is It Safe to Go Outside in Mountlake Terrace Today?
Yes, for most people. Healthy adults and kids can keep their normal routine on a Moderate day in Mountlake Terrace.
If ozone or smoke usually bothers you, plan harder outdoor effort for the morning, before ozone builds. Asthma? Carry your rescue inhaler.
Air Quality This Week in Mountlake Terrace
Air quality in Mountlake Terrace improves to Good by Tomorrow.
Each row is that day's average. Single hours run higher or lower, and the reading at the top of this page is a current measurement rather than an average.
Air Quality and Pollen Are Two Different Numbers
The air quality index tracks pollution: ozone, dust, smoke, and exhaust. Pollen isn't part of the score, so a Good air day in Mountlake Terrace can still be a rough allergy day.
Right now the biggest pollen load in Mountlake Terrace is weed pollen, rated Low. If your eyes itch while the air reads clean, pollen is the likely culprit.
Check today's Mountlake Terrace, WA pollen count →Frequently Asked Questions
What is the AQI in Mountlake Terrace right now?
Today's air in Mountlake Terrace is rated Moderate, level 2 of 6 on the EPA scale. That's the second of six categories. The air is acceptable for almost everyone, with a light caution for people unusually sensitive to ozone or smoke. The reading updates daily, so check back before you head out.
Is it safe to exercise outside in Mountlake Terrace today?
Yes, for most people. Morning is the better window, since ozone peaks between 2 PM and 7 PM. Anyone with asthma should carry a rescue inhaler.
What will the air quality be tomorrow in Mountlake Terrace?
Tomorrow in Mountlake Terrace the forecast averages Good, level 1 of 6 on the EPA scale, with fine particles (PM2.5) near 9 µg/m³. That figure is a daily average, so a few hours can run higher or lower than the number here.
Does Mountlake Terrace have an air quality alert today?
Official alerts come from AirNow.gov and your state air agency, and MyPollenPal doesn't track them directly. Today's EPA category in Mountlake Terrace is Moderate. Days rated Unhealthy for Sensitive Groups or worse usually line up with an official alert.
Sources
- U.S. Environmental Protection Agency / AirNow. "AQI Basics." airnow.gov
- U.S. Environmental Protection Agency. "Particulate Matter (PM) Basics." epa.gov
- U.S. Environmental Protection Agency. "Ground-level Ozone Basics." epa.gov
Air Quality Is Half the Picture
Pollen fills in the rest. See today's tree, grass, and weed levels for Mountlake Terrace, or sign up for a morning email on days when pollen runs High or Very High.