SmogRank / Germany / Saarland / Saarlouis

Saarlouis, month by month

Saarlouis has a measured daily mean on 75 days since 18 June 2026. Its worst month was August 2026, at 51 US AQI (9.1 µg/m³), 1,155th of 2,896 cities on that month's world ranking. Its cleanest was July 2026, at 38 US AQI (6.8 µg/m³).

Every month since 2026

2026too few days for a mean (a year needs 200)75 days measured
JanFebMarAprMayJun8 daysJul38#2,210Aug51#1,155Sep9 daysOct5 days
Each square is a month's mean PM2.5 in US AQI from Saarlouis's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Saarlouis marked; each year, the year's.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

3 months
MonthWhy
Oct 20265 of 12 days measured; a month needs 9. The others: 6 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks.
Sep 20269 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitor, 18 with readings for part of the day (a day needs 18 hours).
Jun 20268 of 30 days measured; a month needs 21. The others: 5 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Saarlouis's worst months

MonthUS AQIDays measuredWorld rankEpisode
August 2026 519.1 µg/m³25 of 311,155thof 2,896Germany, Belgium and 2 more countries, August 2026
July 2026 386.8 µg/m³28 of 312,210thof 2,784–

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Saarlouis's worst days

DayUS AQIEpisode
15 Aug 2026 16068.2 µg/m³Germany, Belgium and 2 more countries, August 2026
17 Aug 2026 8225.9 µg/m³Germany, Belgium and 2 more countries, August 2026
31 Jul 2026 6114.7 µg/m³–
26 Jun 2026 6114.6 µg/m³–
27 Jun 2026 6013.8 µg/m³–
18 Jul 2026 5712.5 µg/m³–
30 Jul 2026 5511.4 µg/m³–
14 Jul 2026 5410.7 µg/m³–
15 Jul 2026 5310.4 µg/m³–
16 Jul 2026 5310.3 µg/m³–

Daily means, the highest since 18 Jun 2026; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Saarlouis, Germany, 18 Jun 2026 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/de/saarlouis/history (accessed 12 Oct 2026).

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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.

Saarlouis now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 21:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).