SmogRank / Romania / Tulcea County / Isaccea

Isaccea, month by month

Isaccea has a measured daily mean on 263 days since 20 December 2025. Its worst month was January 2026, at 63 US AQI (15.8 µg/m³), 707th of 2,617 cities on that month's world ranking. Its cleanest was May 2026, at 41 US AQI (7.3 µg/m³).

Every month since 2025

202653 so far251 days measured923rd of 2,791 in the world
Jan63#707Feb56#1,048Mar57#1,154Apr41#1,809May41#1,539Jun47#960Jul51#1,542Aug57#555Sep44#990Oct7 days
2025too few days for a mean (a year needs 256)12 days measured
JanFebMarAprMayJunJulAugSepOctNovDec12 days
Each square is a month's mean PM2.5 in US AQI from Isaccea'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 Isaccea 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

2 months
MonthWhy
Oct 20267 of 12 days measured; a month needs 9. The others: 1 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks.
Dec 202512 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.

Isaccea's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2026 6315.8 µg/m³29 of 31707thof 2,617Europe, January and February 2026
March 2026 5712.3 µg/m³28 of 311,154thof 2,971–
August 2026 5712.1 µg/m³25 of 31555thof 2,896–
February 2026 5611.8 µg/m³27 of 281,048thof 2,866Europe, January and February 2026
July 2026 519.3 µg/m³30 of 311,542ndof 2,784–
June 2026 478.4 µg/m³23 of 30960thof 2,497–

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.

Isaccea's worst days

DayUS AQIEpisode
20 Jan 2026 9432.3 µg/m³Europe, January and February 2026
15 Jan 2026 8426.8 µg/m³Europe, January and February 2026
24 Jan 2026 8326.1 µg/m³Europe, January and February 2026
17 Jan 2026 8225.9 µg/m³Europe, January and February 2026
14 Jan 2026 7924.3 µg/m³Europe, January and February 2026
16 Jan 2026 7723.2 µg/m³Europe, January and February 2026
24 Feb 2026 7320.7 µg/m³–
21 Jan 2026 7220.5 µg/m³Europe, January and February 2026
13 Jan 2026 7120.1 µg/m³Europe, January and February 2026
3 Mar 2026 7120.1 µg/m³–

Daily means, the highest since 20 Dec 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, Isaccea, Romania, 20 Dec 2025 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ro/isaccea/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.

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

Updated 2026-10-12 20:07 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).