SmogRank / Graz / Wels

Graz vs Wels: PM2.5 compared

Over the last year, Graz's air was 41% more polluted than Wels's: PM2.5 averaged 14.2 µg/m³ against 10.1, on the 332 days both cities were measured. Graz had the dirtier air on 272 of those days, Wels on 58. Graz was over the WHO's daily guideline of 15 µg/m³ on 120 of them, Wels on 79.

Right now

Graz#121on the 24-hour board of 1,616, at 70 US AQI (19.5 µg/m³)
Wels#253on the 24-hour board of 1,616, at 61 US AQI (14.6 µg/m³)

The last year, day by day

Graz
Wels
Each city's daily mean from 6 Oct 2025 to 5 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

15Graz, Nov 2025: 14.9 µg/m³Wels, Nov 2025: 13.5 µg/m³Nov 2025Graz, Dec: 19.5 µg/m³Wels, Dec: 12.3 µg/m³DecGraz, Jan 2026: 32.6 µg/m³Wels, Jan 2026: 19.4 µg/m³Jan 2026Graz, Feb: 19.4 µg/m³Wels, Feb: 13.3 µg/m³FebGraz, Mar: 17.2 µg/m³Wels, Mar: 15.2 µg/m³MarGraz, Apr: 11.0 µg/m³Wels, Apr: 8.7 µg/m³AprGraz, May: 8.1 µg/m³Wels, May: 5.3 µg/m³MayGraz, Jun: 8.4 µg/m³Wels, Jun: 6.1 µg/m³JunGraz, Jul: 8.4 µg/m³Wels, Jul: 5.2 µg/m³JulGraz, Aug: 9.6 µg/m³Wels, Aug: 6.2 µg/m³AugGraz, Sep: 8.4 µg/m³Wels, Sep: 5.7 µg/m³SepOct
Monthly means in µg/m³ over the days both cities were measured. Solid: Graz. Faded: Wels. A month shows once both share 10 such days. Dashed line: the WHO daily guideline.

Year by year

YearGrazWelsDays both measuredDays Graz was worse
2026 so far6052267221
20256055311237
20246754149119
20236151330278

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

Graz

Wels

Daily means in US AQI, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Graz

Side by side with Gratkorn, Wolfsberg, Gujranwala.

Wels

Side by side with Traun, Gujranwala.

Use this page

SmogRank, PM2.5 daily means compared, Graz and Wels, 22 Oct 2025 – 5 Oct 2026, smogrank.com/compare/at-graz/at-wels (accessed 6 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 2026-10-06 21:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.