Minneapolis–St. Paul, MN Air Quality & Smog

Dominant pollutants, when smog is worst, notable historical episodes, and local agency resources for Minneapolis–St. Paul, MN — plus how to check the current AQI. For real-time readings, the free Smog Report iOS app pulls live air quality from EPA AirNow.

Dominant pollutants

PM2.5 (winter heating + wildfire smoke), ozone (summer).

Seasonal pattern: when smog is worst

The Twin Cities have generally clean air, but increasingly experience prolonged wildfire smoke episodes from Canadian fires (May-September). Winter PM2.5 from residential wood-burning and heating, particularly in the I-694 corridor.

A recent or notable event

Summer 2023 — Minneapolis spent ~40 days under Canadian smoke advisories, the most of any summer on record. AQI exceeded 200 multiple times. July 2026 brought another severe episode: smoke from roughly 900 active Canadian fires combined with nearby Minnesota Boundary Waters fires to push the Twin Cities into "unhealthy" territory and beyond. See the full 2026 wildfire smoke event guide.

Local agencies and resources

MPCA runs the AirNow monitors and a publicly accessible interactive map.

• Minnesota Pollution Control Agency (MPCA)
• Minnesota Department of Health

How to check air quality in Minneapolis–St. Paul

The EPA's AirNow.gov publishes the canonical reading from the nearest regulatory monitor. For glanceable iPhone access — including widgets, Live Activities, Siri voice queries, and Apple Watch — install Smog Report. It's free, requires no account, and pulls from the same AirNow API.

For Minneapolis–St. Paul-specific advisories and alerts that go beyond the federal AirNow feed, check the agency pages above directly.

Common questions about Minneapolis–St. Paul air quality

Why does Minneapolis–St. Paul have air-quality and smog problems?

The Twin Cities have generally clean air, but increasingly experience prolonged wildfire smoke episodes from Canadian fires (May-September). Winter PM2.5 from residential wood-burning and heating, particularly in the I-694 corridor.

What are the main air pollutants in Minneapolis–St. Paul?

Minneapolis–St. Paul's dominant pollutants are PM2.5 (winter heating + wildfire smoke), ozone (summer). The AQI on any given day is usually driven by whichever of these is highest.

Has Minneapolis–St. Paul had a major air-quality or smog event?

Summer 2023 — Minneapolis spent ~40 days under Canadian smoke advisories, the most of any summer on record. AQI exceeded 200 multiple times. July 2026 brought another severe episode: smoke from roughly 900 active Canadian fires combined with nearby Minnesota Boundary Waters fires to push the Twin Cities into "unhealthy" territory and beyond. See the full 2026 wildfire smoke event guide.

How can I check Minneapolis–St. Paul's air quality right now?

The EPA's AirNow.gov publishes the official reading from the nearest regulatory monitor. For live AQI on your iPhone — with home-screen widgets, Lock Screen Live Activities, Siri, and Apple Watch — the free Smog Report app pulls from the same AirNow feed. No account is required.

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