Port Townsend vs Tulalip: PM2.5 compared

Over the last year, Tulalip's air was 46% more polluted than Port Townsend's: PM2.5 averaged 6.0 µg/m³ against 4.1, on the 64 days both cities were measured. Tulalip had the dirtier air on 49 of those days, Port Townsend on 14. Tulalip was over the WHO's daily guideline of 15 µg/m³ on 2 of them, Port Townsend on 0.

Right now

Port Townsend#2,195on the 24-hour board of 2,753, at 18 US AQI (3.3 µg/m³)

Tulalip#1,354on the 24-hour board of 2,753, at 38 US AQI (6.8 µg/m³)

The last year, day by day

Port Townsend

Tulalip

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

Year by year

Year	Port Townsend	Tulalip	Days both measured	Days Port Townsend was worse
2026 so far	23	33	64	14
2025	22	14	109	92
2024	23	8	321	318
2023	27	11	252	248

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

Port Townsend

6 Aug 2026529.4 µg/m³
5 Aug 2026519.3 µg/m³
25 Aug 2026376.6 µg/m³

Tulalip

5 Aug 20268527.2 µg/m³
6 Aug 20267321.1 µg/m³
4 Aug 20265913.2 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

Port Townsend

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

Tulalip

Side by side with Picnic Point-North Lynnwood (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, Port Townsend and Tulalip, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/us-port-townsend/us-tulalip (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).