SmogRank / Estonia / Tartu / Tartu

Tartu, month by month

Tartu has a measured daily mean on 683 days since 27 March 2024. Its worst month was January 2026, at 53 US AQI (10.2 µg/m³), 1,074th of 2,617 cities on that month's world ranking. Its cleanest was July 2026, at 16 US AQI (2.8 µg/m³).

Every month since 2024

202631 so far239 days measured2,563rd of 2,793 in the world
Jan53#1,074Feb52#1,482Mar51#1,840Apr16#2,887May18#2,788Jun14 daysJul16#2,767Aug20#2,864Sep19#2,849Oct30#1,905
202529 for the year289 days measured2,503rd of 2,681 in the world
Jan38#1,728Feb49#1,385Mar34#2,260Apr21#2,834May19 daysJun17 daysJul21#2,785Aug16#2,890Sep24#2,864Oct13 daysNov47#1,422Dec22#2,855
2024too few days for a mean (a year needs 257)155 days measured
JanFebMar5 daysApr23#2,211May21#2,491Jun7 daysJul21 daysAug11 daysSepnoneOct11 daysNov19 daysDec23#2,441
Each square is a month's mean PM2.5 in US AQI from Tartu'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 Tartu marked; each year, the year's. A dashed square is the running month, so far.
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

11 months
MonthWhy
Jun 202614 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
Oct 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jun 202517 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
May 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Nov 202419 of 30 days measured; a month needs 21. 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.
Jul 202421 of 31 days measured; a month needs 22. The others: 10 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.

Tartu's worst months

MonthUS AQIDays measuredWorld rank
January 2026 5310.2 µg/m³27 of 311,074thof 2,617
February 2026 529.7 µg/m³26 of 281,482ndof 2,866
March 2026 519.2 µg/m³31 of 311,840thof 2,971
February 2025 498.8 µg/m³22 of 281,385thof 2,633
November 2025 478.4 µg/m³24 of 301,422ndof 2,715
January 2025 386.9 µg/m³26 of 311,728thof 2,474

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.

Tartu's worst days

DayUS AQI
26 Nov 2025 9029.8 µg/m³
24 Jun 2024 8226.0 µg/m³
19 Jan 2026 7722.9 µg/m³
24 Feb 2025 7522.1 µg/m³
11 Feb 2026 7421.6 µg/m³
20 Oct 2025 7421.4 µg/m³
18 Jan 2026 7220.5 µg/m³
10 Mar 2026 7119.7 µg/m³
12 Mar 2026 7019.2 µg/m³
11 Mar 2026 7019.1 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, Tartu, Estonia, 27 Mar 2024 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ee/tartu/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.

Tartu 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).