SmogRank / India / Assam / Silchar

Silchar, month by month

Silchar has a measured daily mean on 501 days since 25 March 2025. Its worst month was February 2026, at 99 US AQI (34.7 µg/m³), 199th of 2,866 cities on that month's world ranking. Its cleanest was June 2026, at 70 US AQI (19.4 µg/m³).

Every month since 2025

202679 so far248 days measured275th of 2,791 in the world
Jan20 daysFeb99#199Mar82#389Apr79#323May74#261Jun70#257Jul71#331Aug76#201Sep74#237Oct5 days
2025too few days for a mean (a year needs 256)253 days measured
JanFebMar1 dayApr16 daysMay75#229Jun72#224Jul76#161Aug75#172Sep75#171Oct82#222Nov85#272Dec94#281
Each square is a month's mean PM2.5 in US AQI from Silchar'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 Silchar 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

4 months
MonthWhy
Oct 20265 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Jan 202620 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Apr 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Mar 20251 of 31 days measured; a month needs 22. The others: 6 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.

Silchar's worst months

MonthUS AQIDays measuredWorld rank
February 2026 9934.7 µg/m³20 of 28199thof 2,866
December 2025 9432.3 µg/m³31 of 31281stof 3,006
November 2025 8527.5 µg/m³29 of 30272ndof 2,715
March 2026 8226.0 µg/m³30 of 31389thof 2,971
October 2025 8225.8 µg/m³28 of 31222ndof 2,614
April 2026 7924.1 µg/m³29 of 30323rdof 2,941

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.

Silchar's worst days

DayUS AQI
4 Jan 2026 13750.0 µg/m³
31 Dec 2025 12645.6 µg/m³
8 Mar 2026 12244.0 µg/m³
7 Mar 2026 11942.9 µg/m³
15 Feb 2026 11240.0 µg/m³
13 Feb 2026 11139.6 µg/m³
9 Mar 2026 11139.6 µg/m³
25 Dec 2025 11139.5 µg/m³
11 Feb 2026 11139.5 µg/m³
25 Jan 2026 11039.3 µg/m³

Daily means, the highest since 25 Mar 2025; 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, Silchar, India, 25 Mar 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/silchar/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.

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

Updated 2026-10-12 19:07 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).