Baraboo vs Middleton: PM2.5 compared

Over the last year, Baraboo's air was 17% more polluted than Middleton's: PM2.5 averaged 7.7 µg/m³ against 6.6, on the 314 days both cities were measured. Baraboo had the dirtier air on 226 of those days, Middleton on 87. Baraboo was over the WHO's daily guideline of 15 µg/m³ on 16 of them, Middleton on 32.

Right now

Baraboo#2,278on the 24-hour board of 2,753, at 17 US AQI (3.1 µg/m³)

Middleton#2,674on the 24-hour board of 2,753, at 9 US AQI (1.7 µg/m³)

The last year, day by day

Baraboo

Middleton

Each city's daily mean from 9 Oct 2025 to 8 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Baraboo. Faded: Middleton. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Baraboo	Middleton	Days both measured	Days Baraboo was worse
2026 so far	45	39	248	181
2025	33	27	86	61

Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.

Each city's worst days

Baraboo

16 Jul 2026287212.0 µg/m³
19 Jul 2026191113.0 µg/m³
17 Jul 2026191112.0 µg/m³

Middleton

16 Jul 2026233158.0 µg/m³
17 Jul 2026189110.0 µg/m³
19 Jul 2026185104.0 µg/m³

Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Baraboo

Side by side with Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).

Middleton

Side by side with Madison (the nearest), Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Baraboo and Middleton, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/us-baraboo/us-middleton (accessed 9 Oct 2026).

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.

Updated 2026-10-09 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).