SmogRank / Azerbaijan / Baki / Baku

Baku, month by month

Baku has a measured daily mean on 799 days since 1 January 2023. Its worst month was January 2023, at 92 US AQI (31.1 µg/m³), 61st of 1,261 cities on that month's world ranking. Its cleanest was August 2026, at 63 US AQI (15.4 µg/m³). 2024 averaged 79 US AQI (24.0 µg/m³), against 75 US AQI (22.1 µg/m³) in 2023.

Every month since 2023

2026too few days for a mean (a year needs 199)129 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJun65#291Jul65#440Aug63#377Sep68#302Oct65#181
2025too few days for a mean (a year needs 256)58 days measured
Jan89#98Feb72#515Mar3 daysAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202479 for the year333 days measured77th of 2,097 in the world
Jan71#277Feb85#124Mar75#124Apr74#195May84#80Jun82#58Jul77#84Aug80#72Sep7 daysOct68#149Nov73#193Dec85#125
202375 for the year279 days measured64th of 1,355 in the world
Jan92#61Feb1 dayMar8 daysApr77#85May70#108Jun68#304Jul69#84Aug75#105Sep77#73Oct70#71Nov69#85Dec85#78
Each square is a month's mean PM2.5 in US AQI from Baku'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 Baku 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

18 months
MonthWhy
May 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 20253 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Sep 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 20238 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Feb 20231 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 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.

Baku's worst months

MonthUS AQIDays measuredWorld rank
January 2023 9231.1 µg/m³26 of 3161stof 1,261
January 2025 8929.5 µg/m³27 of 3198thof 2,474
December 2024 8527.3 µg/m³31 of 31125thof 2,616
December 2023 8527.2 µg/m³28 of 3178thof 2,247
February 2024 8527.1 µg/m³28 of 29124thof 2,486
May 2024 8426.8 µg/m³31 of 3180thof 2,684

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.

Baku's worst days

DayUS AQI
13 Dec 2023 221146.0 µg/m³
26 May 2024 215140.0 µg/m³
3 Sept 2024 215140.0 µg/m³
30 Jul 2024 17792.3 µg/m³
27 May 2024 17083.0 µg/m³
17 Feb 2024 16271.3 µg/m³
5 Aug 2024 16170.0 µg/m³
9 Aug 2024 16068.9 µg/m³
30 Jan 2023 15865.8 µg/m³
31 Jan 2023 15560.9 µg/m³

Daily means, the highest since 1 Jan 2023; 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, Baku, Azerbaijan, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/az/baku/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.

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

Updated 2026-10-12 19:07 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).