Framingham vs Newton: PM2.5 compared

Over the last year, Framingham's air was 49% more polluted than Newton's: PM2.5 averaged 6.1 µg/m³ against 4.1, on the 199 days both cities were measured. Framingham had the dirtier air on 164 of those days, Newton on 34. Framingham was over the WHO's daily guideline of 15 µg/m³ on 5 of them, Newton on 8.

Right now

Framingham#2,229on the 24-hour board of 2,753, at 18 US AQI (3.2 µg/m³)

Newton#2,749on the 24-hour board of 2,753, at 1 US AQI (0.1 µg/m³)

The last year, day by day

Framingham

Newton

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: Framingham. Faded: Newton. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Framingham	Newton	Days both measured	Days Framingham was worse
2026 so far	36	23	135	114
2025	30	21	84	67

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

Framingham

18 Feb 20268024.6 µg/m³
18 Jan 20266918.5 µg/m³
6 Jan 20266717.8 µg/m³

Newton

18 Feb 202610235.9 µg/m³
18 Jan 20269834.3 µg/m³
6 Jan 20268828.8 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

Framingham

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

Newton

Side by side with Lexington (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, Framingham and Newton, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/us-framingham/us-newton (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).