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.

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.

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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