SmogRank / Estonia / Ida-Virumaa / Kohtla-Järve

Kohtla-Järve, month by month

Kohtla-Järve has a measured daily mean on 668 days since 27 March 2024. Its worst month was May 2024, at 33 US AQI (5.9 µg/m³), 2,043rd of 2,684 cities on that month's world ranking. Its cleanest was April 2026, at 13 US AQI (2.4 µg/m³).

Every month since 2024

202623 so far229 days measured2,743rd of 2,798 in the world
Jan21 daysFeb27#2,614Mar32#2,578Apr13#2,920May17#2,803Jun16 daysJul18#2,749Aug21#2,856Sep14#2,962Oct8 days
202522 for the year280 days measured2,638th of 2,681 in the world
Jan28#2,231Feb32#2,206Mar13#2,843Apr14#2,938May20 daysJun18 daysJul32#2,420Aug21#2,824Sep23#2,893Oct17 daysNov27#2,433Dec16#2,960
2024too few days for a mean (a year needs 257)159 days measured
JanFebMar5 daysApr25#2,118May33#2,043Jun7 daysJul19#2,491Aug11 daysSepnoneOct11 daysNov20#2,507Dec24#2,391
Each square is a month's mean PM2.5 in US AQI from Kohtla-Järve'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 Kohtla-Järve 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

11 months
MonthWhy
Oct 20268 of 12 days measured; a month needs 9. The others: 3 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jun 202616 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
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.
Oct 202517 of 31 days measured; a month needs 22. The others: 14 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.
May 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202411 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202411 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jun 20247 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
Mar 20245 of 31 days measured; a month needs 22.

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

Kohtla-Järve's worst months

MonthUS AQIDays measuredWorld rank
May 2024 335.9 µg/m³28 of 312,043rdof 2,684
February 2025 325.7 µg/m³21 of 282,206thof 2,633
July 2025 325.7 µg/m³30 of 312,420thof 2,889
March 2026 325.7 µg/m³28 of 312,578thof 2,971
January 2025 285.0 µg/m³26 of 312,231stof 2,474
November 2025 274.9 µg/m³24 of 302,433rdof 2,715

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.

Kohtla-Järve's worst days

DayUS AQI
10 Feb 2025 7421.2 µg/m³
19 Jan 2026 7220.4 µg/m³
9 Dec 2024 6918.5 µg/m³
20 Jan 2026 6516.8 µg/m³
12 Mar 2026 6416.2 µg/m³
16 Jan 2026 6416.0 µg/m³
9 Feb 2025 6315.7 µg/m³
13 Jan 2026 6315.4 µg/m³
13 Jul 2025 6215.2 µg/m³
18 Jan 2026 6215.2 µg/m³

Daily means, the highest since 27 Mar 2024; 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, Kohtla-Järve, Estonia, 27 Mar 2024 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ee/kohtla-jaerve/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.

Kohtla-Järve 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).