SmogRank / Breda / Haarlem

Breda vs Haarlem: PM2.5 compared

Over the last year, Haarlem's air was 40% more polluted than Breda's: PM2.5 averaged 12.5 µg/m³ against 8.9, on the 352 days both cities were measured. Haarlem had the dirtier air on 172 of those days, Breda on 177. Haarlem was over the WHO's daily guideline of 15 µg/m³ on 103 of them, Breda on 42.

Right now

Breda#98on the 24-hour board of 1,669, at 73 US AQI (20.7 µg/m³)
Haarlem#337on the 24-hour board of 1,669, at 58 US AQI (12.7 µg/m³)

The last year, day by day

Breda
Haarlem
Each city's daily mean from 7 Oct 2025 to 6 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

15Breda, Nov 2025: 9.0 µg/m³Haarlem, Nov 2025: 13.5 µg/m³Nov 2025Breda, Dec: 10.5 µg/m³Haarlem, Dec: 17.5 µg/m³DecBreda, Jan 2026: 15.1 µg/m³Haarlem, Jan 2026: 28.6 µg/m³Jan 2026Breda, Feb: 10.0 µg/m³Haarlem, Feb: 24.2 µg/m³FebBreda, Mar: 14.7 µg/m³Haarlem, Mar: 19.8 µg/m³MarBreda, Apr: 8.0 µg/m³Haarlem, Apr: 7.5 µg/m³AprBreda, May: 8.0 µg/m³Haarlem, May: 10.7 µg/m³MayBreda, Jun: 5.2 µg/m³Haarlem, Jun: 6.1 µg/m³JunBreda, Jul: 5.2 µg/m³Haarlem, Jul: 5.4 µg/m³JulBreda, Aug: 5.4 µg/m³Haarlem, Aug: 4.7 µg/m³AugBreda, Sep: 7.1 µg/m³Haarlem, Sep: 5.2 µg/m³SepOct
Monthly means in µg/m³ over the days both cities were measured. Solid: Breda. Faded: Haarlem. A month shows once both share 10 such days. Dashed line: the WHO daily guideline.

Year by year

YearBredaHaarlemDays both measuredDays Breda was worse
2026 so far4957268137
2025495710249

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

Breda

Haarlem

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

Breda

Side by side with Tilburg, Venray, Gujranwala.

Haarlem

Side by side with Zwanenburg, Gujranwala.

Use this page

SmogRank, PM2.5 daily means compared, Breda and Haarlem, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/nl-breda/nl-haarlem (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 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.