SmogRank / India / Kerala / Uliyazhathura

Uliyazhathura, month by month

Uliyazhathura has a measured daily mean on 448 days since 19 February 2025. Its worst month was December 2025, at 163 US AQI (72.9 µg/m³), 98th of 3,006 cities on that month's world ranking. Its cleanest was October 2025, at 71 US AQI (19.8 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 200)195 days measured
Jan16 daysFeb16 daysMar90#275Apr16 daysMay14 daysJun19 daysJul80#221Aug73#228Sep82#166Oct6 days
2025too few days for a mean (a year needs 256)253 days measured
JanFeb10 daysMar83#400Apr82#222May21 daysJun11 daysJul76#158Aug78#147Sep77#160Oct71#286Nov77#329Dec163#98
Each square is a month's mean PM2.5 in US AQI from Uliyazhathura'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 Uliyazhathura marked; each year, the year's.
Good0–50
Moderate51–100
Unhealthy for 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

9 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jun 202619 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
May 202614 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Apr 202616 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Feb 202616 of 28 days measured; a month needs 20. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jan 202616 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jun 202511 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
May 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Feb 202510 of 28 days measured; a month needs 20.

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

Uliyazhathura's worst months

MonthUS AQIDays measuredWorld rank
December 2025 16372.9 µg/m³28 of 3198thof 3,006
March 2026 9030.2 µg/m³26 of 31275thof 2,971
March 2025 8326.2 µg/m³31 of 31400thof 2,862
April 2025 8225.9 µg/m³24 of 30222ndof 2,951
September 2026 8225.9 µg/m³28 of 30166thof 2,997
July 2026 8024.8 µg/m³28 of 31221stof 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.

Uliyazhathura's worst days

DayUS AQI
22 Dec 2025 185104.0 µg/m³
27 Feb 2026 184102.0 µg/m³
30 Dec 2025 183101.0 µg/m³
12 Dec 2025 18198.3 µg/m³
31 Dec 2025 18197.6 µg/m³
30 Jan 2026 18097.3 µg/m³
23 Dec 2025 17995.7 µg/m³
13 Dec 2025 17893.9 µg/m³
29 Jan 2026 17590.3 µg/m³
14 Dec 2025 17589.1 µg/m³

Daily means, the highest since 19 Feb 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, Uliyazhathura, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/uliyazhathura/history (accessed 13 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.

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

Updated 2026-10-13 04:07 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).