Why did the Black Heaven regime again in Krasnoyarsk?

In recent days, the Black Sky has returned to us again. What factors affect the purity of air in Krasnoyarsk and which one is the most serious? Why did this time hang over areas with skyscrapers?

And why are the testimonies of the Ministry of Ecology and the Nebo.live project in terms of air quality are very different? We talked with the ecologist Sergei Mikhailu.