The people in the metropolis of Moscow complain about unusual smog and an intense smell of burning in almost all parts of the Russian capital.
Also in the center, where the Kremlin and government buildings are, there was a haze on Thursday - passers-by complained of a pungent odor in their noses.
Temperatures of over 30 degrees Celsius were expected.
The Ministry of Civil Defense announced that forest fires were raging in the south-east of Moscow in the Ryazan region and the smoke had spread as far as Moscow.
The authorities in Europe's largest city, which according to official figures has more than 12, but according to estimates more than 15 million inhabitants, reported numerous complaints from citizens.
Moscow Mayor Sergei Sobyanin announced that 240 emergency services and almost 78 units of technology had been sent to the Ryazan region from the capital.
complaints from environmentalists
In Russia, as every year, there are massive forest fires in many parts of the country.
The environmental organization Greenpeace speaks of a catastrophic situation.
Huge areas in the largest country on earth by area are on fire.
Again and again there are complaints from environmentalists that the authorities are not doing enough to fight the fires.
Russian state media had also reported that some of the soldiers who were otherwise deployed to extinguish the fire were also deployed during the war in Ukraine and were therefore currently not available to save the forest.