SmogRank / Switzerland / Schwyz / Küssnacht

Küssnacht, month by month

Küssnacht has a measured daily mean on 1,021 days since 1 January 2023. Its worst month was June 2023, at 48 US AQI (8.7 µg/m³), 989th of 1,603 cities on that month's world ranking. Its cleanest was November 2023, at 6 US AQI (1.0 µg/m³). 2025 averaged 24 US AQI (4.3 µg/m³), against 24 US AQI (4.4 µg/m³) in 2023.

Every month since 2023

202626 so far241 days measured2,693rd of 2,793 in the world
Jan13#2,599Feb10#2,862Mar44#2,137Apr23#2,676May20#2,729Jun15 daysJul32#2,469Aug33#2,462Sep22#2,768Oct21#2,539
202524 for the year303 days measured2,613th of 2,681 in the world
Jan16#2,452Feb44#1,586Mar26#2,549Apr21#2,834May24#2,515Jun19 daysJul22#2,771Aug38#2,249Sep13#3,088Oct18#2,554Nov14#2,689Dec18#2,938
2024too few days for a mean (a year needs 257)202 days measured
Jan18#2,336Feb19#2,378Mar10 daysAprnoneMay14#2,623Jun5 daysJul23#2,416Aug15 daysSepnoneOct14 daysNov17#2,562Dec9#2,613
202324 for the year275 days measured1,306th of 1,355 in the world
Jan8 daysFeb2 daysMar11 daysApr23#1,463May33#1,297Jun48#989Jul26#1,280Aug31#1,744Sep32#1,864Oct24#1,870Nov6#2,242Dec6#2,245
Each square is a month's mean PM2.5 in US AQI from Küssnacht'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 Küssnacht marked; each year, the year's. A dashed square is the running month, so far.
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

11 months
MonthWhy
Jun 202615 of 30 days measured; a month needs 21. The others: 11 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours).
Jun 202519 of 30 days measured; a month needs 21. The others: 11 with readings for part of the day (a day needs 18 hours).
Oct 202414 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours).
Sep 2024No day measured. The others: 5 with no readings from the monitor, 25 with readings for part of the day (a day needs 18 hours).
Aug 202415 of 31 days measured; a month needs 22. The others: 8 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours).
Jun 20245 of 30 days measured; a month needs 21. The others: 23 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Apr 2024No day measured. The others: 30 with no readings from the monitor.
Mar 202410 of 31 days measured; a month needs 22. The others: 19 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20232 of 28 days measured; a month needs 20. The others: 1 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive.
Jan 20238 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours), 7 missing from OpenAQ's archive.

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

Küssnacht's worst months

MonthUS AQIDays measuredWorld rankEpisode
June 2023 488.7 µg/m³30 of 30989thof 1,603–
February 2025 448.0 µg/m³21 of 281,586thof 2,633–
March 2026 448.0 µg/m³31 of 312,137thof 2,971Europe, 1 to 12 March 2026
August 2025 386.8 µg/m³31 of 312,249thof 2,901–
May 2023 336.0 µg/m³31 of 311,297thof 1,600–
August 2026 336.0 µg/m³25 of 312,462ndof 2,896–

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.

Küssnacht's worst days

DayUS AQIEpisode
7 Mar 2026 8527.3 µg/m³Europe, 1 to 12 March 2026
8 Mar 2026 8427.0 µg/m³Europe, 1 to 12 March 2026
10 Jun 2025 7924.3 µg/m³–
6 Mar 2026 7421.7 µg/m³Europe, 1 to 12 March 2026
12 Jun 2025 7320.9 µg/m³–
11 Jun 2025 7220.5 µg/m³–
29 Jun 2024 6416.3 µg/m³–
9 Feb 2025 6416.1 µg/m³–
7 Feb 2025 6315.7 µg/m³–
10 Feb 2025 6315.7 µg/m³–

Daily means, the highest since 1 Jan 2023; 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, Küssnacht, Switzerland, 1 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ch/kuessnacht/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.

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

Updated 2026-10-12 22:07 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).