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Troitske fire, September 2025 Троїцький район · Troitske

Out · last measured on 21 Sept 2025

The fire started on 21 September 2025 in Troitske, Ukraine, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 111 hectares from satellite imagery, spread across a single municipality.

It is the 807th largest in Luhansk Oblast since 2016 (of 909 with a page). Number 1220 in Ukraine in 2025, of 1359.

Compare with…

Suggestions: Svatove · 2024Troitske · 2024Svatove · 2024Troitske · 2024

We have the Copernicus perimeter for this fire, but not yet its hotspots: NASA publishes the yearly hotspot archive only once the year closes. The page picks it up automatically when it is available.

Burnt area
111ha
Copernicus perimeter
Duration
1day
21 Sept 2025 – 21 Sept 2025
Municipalities hit
1
districts
Started on
21 Sept
2025
Danger at start
19
Moderate · FWI index

Where it burned

The weather it burned in

24°high
28km/h · peak gust
35%lowest humidity

It had gone 0 days without rain (1 mm or more) when it started.

This area had burned before

16% of the perimeter overlaps earlier fires recorded since 2016: 18 ha in 2024.

What happened to each town

  1. Troitske Троїцький район 20,833 inhabitants · 19.0 km from the centre where it started
    111 ha reached on 15 Sept
    0.1 %

Burnt area inside each municipality, from crossing the official perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.

What burned

  • Other natural land80 %
  • Agricultural areas18 %
  • Mixed forest1.8 %

Land cover inside the perimeter as reported by Copernicus EFFIS (outside the Corine Land Cover area).

People and buildings inside the perimeter

GHSL 2025
Built-up area0.34 ha
Residents< 20

Inside the perimeter there were about 0.34 hectares of built-up land and almost nobody lived there (GHSL 2025, satellite-based estimate).

This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.

Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu

The weather day by day

ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.

Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

Day High Min. humidity Peak gust Rain Danger (FWI)
21 Sept 23.8 °C 35 % 28 km/h 0.0 mm Moderate 19
22 Sept after 30.0 °C 28 % 31 km/h 0.0 mm High 29
23 Sept after 30.1 °C 24 % 21 km/h 0.0 mm High 29
24 Sept after 26.9 °C 28 % 43 km/h 0.0 mm Very high 42
25 Sept after 15.1 °C 31 % 44 km/h 0.3 mm High 35
26 Sept after 13.3 °C 37 % 34 km/h 0.0 mm High 26
27 Sept after 16.6 °C 34 % 24 km/h 0.0 mm High 22
28 Sept after 17.4 °C 33 % 23 km/h 0.0 mm High 23
29 Sept after 17.1 °C 29 % 48 km/h 0.0 mm High 35
30 Sept after 12.3 °C 31 % 52 km/h 0.0 mm High 36
1 Oct after 12.5 °C 19 % 48 km/h 0.1 mm High 36

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

Before · 14 Sept 2025
After · 28 Sept 2025

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

The smoke

CAMS · Copernicus

On 23 September 2025 the air beside the fire reached 18 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak18 µg/m³
Days over the guideline0 days
PM1027 µg/m³
Optical depth0.27
192021222324
Good Fair Moderate Poor Very poor Extremely poor

Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.

Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)

Other fires nearby

All fires in Ukraine ›

Frequently asked questions

How long did the Troitske fire last?
Copernicus dates it between 21 September 2025 and 21 September 2025: 1 day between the first and last image with fire.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 111 hectares (1.1 km²). Official national figures may differ.
Which municipalities burned?
The fire only entered Troitske (111 ha, 0.1 %).
Did the fire reach a town?
The fire started in Troitske and came within 19.0 km of its centre. That is the distance from the perimeter, or the nearest hotspot, to the point marking the centre; it does not mean it entered the houses.
What was the weather like?
During the fire the temperature reached 23.8 °C, humidity dropped to 35 % and gusts hit 28 km/h. The fire danger index (FWI) reached 19, class Moderate.
Where does this data come from?
From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Ukraine (geoBoundaries). It is not an official report.

Where to verify it

A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.

Emergency number: 101 · 112 · Emergency number and official warnings ›

Satellite cross-check

History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

No changes since 24 October 2026.

RSS Changes to this page

Does something look wrong on this page?

This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.

Report an error
What do you think is wrong?

We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 101 · 112.

How we know this
  • Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
  • Dates from the perimeter: the VIIRS detections inside it did not change them. No Suomi-NPP VIIRS detections on those dates.
  • We have not matched this page with any official record.
  • Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
  • Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.

How we build fire pages: methodology ›

Where this data comes from

The perimeter and land cover come from the Copernicus European Forest Fire Information System (EFFIS), measured on MODIS and Sentinel-2 imagery and published under CC BY 4.0. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Public Domain). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ slightly from each country’s official figure.