Coyhaique vs Stanley: PM2.5 compared

Over the last year, Coyhaique's air was about 135.1× as polluted as Stanley's: PM2.5 averaged 94.6 µg/m³ against 0.7, on the 54 days both cities were measured. Coyhaique had the dirtier air on 54 of those days, Stanley on 0. Coyhaique was over the WHO's daily guideline of 15 µg/m³ on 54 of them, Stanley on 0.

Right now

Coyhaique#65on the 24-hour board of 2,753, at 89 US AQI (29.7 µg/m³)

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

The last year, day by day

Coyhaique

Stanley

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

Each city's worst days

Coyhaique

3 Jul 2026500+398.5 µg/m³
4 Jul 2026500+325.5 µg/m³
10 Jul 2026467309.0 µg/m³

Stanley

14 Apr 2026509.0 µg/m³
9 May 2026203.6 µg/m³
13 Apr 2026142.5 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

Coyhaique

Side by side with Puerto Aysén (the nearest), Puerto Varas (Chile's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).

Stanley

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

Use this page

SmogRank, PM2.5 daily means compared, Coyhaique and Stanley, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/cl-coyhaique/fk-stanley (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).