Portland Median AQI 2022: Historical Air Quality Data
Explore 2022 air quality data for Portland, including the median AQI, seasonal patterns, pollution trends, and how air quality changed over the year.
Current Air Quality
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Extra Protection for Portland Homes
Air quality in Portland is moderate (AQI 57), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Levoit Core 400S — True HEPA · CADR ~260 CFM · rooms up to 403 sq ft
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Portland Air Quality in 2022
Historical air quality data for Portland in 2022 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 Portland Air Quality →Portland 2022 Air Quality Snapshot
Across 2022, Portland's median AQI was around 61 (Moderate), based on current readings and seasonal patterns for the Portland-South Portland-Biddeford reporting area. That means a typical day fell near AQI 61, with the dominant pollutant being fine particulate matter (PM2.5), which is common for the Northeast region.
How Portland Air Quality Changed by Season in 2022
Spring (Mar–May): Usually Portland's cleanest stretch, with AQI near 43. Mild temperatures and better atmospheric mixing keep both ozone and particulates low.
Summer (Jun–Aug): AQI climbs toward 69 as heat and sunlight drive higher ozone and, in the West, wildfire-smoke episodes. 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 Northeast region.
Winter (Dec–Feb): AQI near 81. 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 Portland?
With Portland's AQI at 57 (Moderate), outdoor exercise is generally safe for most people. If you have asthma, heart or lung conditions, or are exercising children or older adults, schedule strenuous workouts for the early morning (6–10 AM) when PM2.5 levels are lowest and watch for symptoms like coughing or chest tightness.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Portland's Air Pollution?
In Portland, the leading pollutant is fine particulate matter (PM2.5). As part of the Northeast region, the main drivers of air pollution here are:
- •Dense urban vehicle traffic and congestion
- •Building heating systems burning oil and natural gas
- •Ozone and fine particulates transported from upwind states
- •Construction and demolition activity in growing metros
Dig deeper: Portland PM2.5 levels · Portland ozone levels
Air Purifier & Monitor Buying Guides
Not sure which device fits your needs? Our hands-on guides break down the best picks by use case.
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 Portland Air Quality
What is the current air quality in Portland?
The current Air Quality Index (AQI) in Portland, ME is 57, which is considered moderate.
Is it safe to exercise outdoors in Portland?
Generally yes. With an AQI of 57, outdoor exercise is acceptable for most people. Sensitive individuals should monitor symptoms.
When is the best time of year to visit Portland for good air quality?
Spring and early fall typically offer the best air quality in Portland. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Portland?
Air pollution in Portland 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
Extra Protection for Portland Homes
Air quality in Portland is moderate (AQI 57), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Compare top-rated True-HEPA purifiers:
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