Tacoma Median AQI 2024: Historical Air Quality Data
Explore 2024 air quality data for Tacoma, including the median AQI, seasonal patterns, pollution trends, and how air quality changed over the year.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Tacoma Air Quality in 2024
Historical air quality data for Tacoma in 2024 shows how pollution levels have changed over time. Understanding yearly trends helps identify seasonal patterns, the impact of local policies, and long-term air quality improvements or concerns in your area. Check current conditions below for today's AQI reading.
View Current Tacoma Air Quality →Tacoma 2024 Air Quality Snapshot
Across 2024, Tacoma's median AQI was around 39 (Good), based on current readings and seasonal patterns for the Seattle-Tacoma-Bellevue reporting area. That means a typical day fell near AQI 39, with the dominant pollutant being ground-level ozone (O3), which is common for the Pacific Northwest region.
How Tacoma Air Quality Changed by Season in 2024
Spring (Mar–May): Usually Tacoma's cleanest stretch, with AQI near 21. Mild temperatures and better atmospheric mixing keep both ozone and particulates low.
Summer (Jun–Aug): AQI climbs toward 63 as heat and sunlight drive ozone formation to its yearly peak. Afternoons are the worst time to be outside.
Fall (Sep–Nov): Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Pacific Northwest region.
Winter (Dec–Feb): AQI near 41. Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Is It Safe to Exercise Outside in Tacoma?
With Tacoma's AQI at 35 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Tacoma's Air Pollution?
In Tacoma, the leading pollutant is ground-level ozone (O3). As part of the Pacific Northwest region, the main drivers of air pollution here are:
- •Wildfire smoke, increasingly severe in summer and fall
- •Vehicle emissions along the I-5 corridor
- •Wood-burning for residential heating
- •Industrial and port activity
Dig deeper: Tacoma PM2.5 levels · Tacoma ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Tacoma Air Quality
What is the current air quality in Tacoma?
The current Air Quality Index (AQI) in Tacoma, WA is 35, which is considered good.
Is it safe to exercise outdoors in Tacoma?
Yes, with an AQI of 35, outdoor exercise is safe for everyone in Tacoma.
When is the best time of year to visit Tacoma for good air quality?
Spring and early fall typically offer the best air quality in Tacoma. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Tacoma?
Air pollution in Tacoma can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Reduce Indoor Ozone in Tacoma
Today's main pollutant in Tacoma is ground-level ozone (AQI 35). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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