SmogRank / India / Odisha / Dera Colliery Township

Dera Colliery Township, month by month

Dera Colliery Township has a measured daily mean on 443 days since 19 February 2025. Its worst month was December 2025, at 202 US AQI (126.3 µg/m³), 33rd of 3,006 cities on that month's world ranking. Its cleanest was July 2025, at 80 US AQI (24.4 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 200)196 days measured
Jan20 daysFeb163#34Mar132#91Apr114#125May87#195Jun133#53Jul8 daysAug18 daysSep16 daysOct6 days
2025too few days for a mean (a year needs 256)247 days measured
JanFeb9 daysMar19 daysApr20 daysMay93#134Jun20 daysJul80#141Aug81#125Sep10 daysOct117#127Nov172#62Dec202#33
Each square is a month's mean PM2.5 in US AQI from Dera Colliery Township'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 Dera Colliery Township 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

10 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. The others: 6 with no readings from the monitor.
Sep 202616 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitor, 11 with readings for part of the day (a day needs 18 hours).
Aug 202618 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jul 20268 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
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.
Sep 202510 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jun 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Apr 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Mar 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Feb 20259 of 28 days measured; a month needs 20. The others: 1 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.

Dera Colliery Township's worst months

MonthUS AQIDays measuredWorld rank
December 2025 202126.3 µg/m³31 of 3133rdof 3,006
November 2025 17284.8 µg/m³28 of 3062ndof 2,715
February 2026 16372.0 µg/m³21 of 2834thof 2,866
June 2026 13348.4 µg/m³24 of 3053rdof 2,497
March 2026 13248.2 µg/m³30 of 3191stof 2,971
October 2025 11741.9 µg/m³25 of 31127thof 2,614

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.

Dera Colliery Township's worst days

DayUS AQI
2 Jan 2026 344247.0 µg/m³
23 Dec 2025 265190.0 µg/m³
24 Dec 2025 256181.0 µg/m³
1 Jan 2026 255180.0 µg/m³
29 Dec 2025 251176.0 µg/m³
3 Jan 2026 242167.0 µg/m³
30 Dec 2025 232157.0 µg/m³
25 Dec 2025 231156.0 µg/m³
14 Dec 2025 230155.0 µg/m³
20 Dec 2025 225150.0 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, Dera Colliery Township, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/dera-colliery-township/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.

Dera Colliery Township 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).