SmogRank / India / Tamil Nadu / Naduvattam

Naduvattam, month by month

Naduvattam has a measured daily mean on 486 days since 19 February 2025. Its worst month was February 2026, at 72 US AQI (20.2 µg/m³), 549th of 2,866 cities on that month's world ranking. Its cleanest was June 2026, at 66 US AQI (17.2 µg/m³).

Every month since 2025

202669 so far234 days measured390th of 2,798 in the world
Jan21 daysFeb72#549Mar71#605Apr68#440May68#332Jun66#286Jul67#400Aug67#310Sep67#305Oct5 days
2025too few days for a mean (a year needs 256)252 days measured
JanFeb10 daysMar16 daysApr69#401May68#312Jun18 daysJul67#256Aug69#230Sep67#267Oct68#303Nov67#483Dec68#582
Each square is a month's mean PM2.5 in US AQI from Naduvattam'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 Naduvattam 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

5 months
MonthWhy
Oct 20265 of 12 days measured; a month needs 9. The others: 6 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jan 202621 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jun 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Mar 202516 of 31 days measured; a month needs 22. The others: 15 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.

Naduvattam's worst months

MonthUS AQIDays measuredWorld rank
February 2026 7220.2 µg/m³20 of 28549thof 2,866
March 2026 7120.0 µg/m³26 of 31605thof 2,971
April 2025 6918.7 µg/m³21 of 30401stof 2,951
August 2025 6918.7 µg/m³22 of 31230thof 2,901
October 2025 6818.4 µg/m³30 of 31303rdof 2,614
December 2025 6818.3 µg/m³30 of 31582ndof 3,006

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.

Naduvattam's worst days

DayUS AQI
31 Jan 2026 17691.8 µg/m³
6 Feb 2026 9834.4 µg/m³
2 Mar 2026 9029.9 µg/m³
11 Feb 2026 8929.4 µg/m³
4 Mar 2026 8527.4 µg/m³
21 Oct 2025 8225.8 µg/m³
22 Jan 2026 8225.7 µg/m³
23 Apr 2025 8125.3 µg/m³
22 Oct 2025 8024.7 µg/m³
9 Jan 2026 8024.5 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, Naduvattam, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/naduvattam-tamil-nadu/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.

Naduvattam 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).