"Hydrogen sulfide attack on Moscow ended just as quickly and mysteriously as it began. Already on the 11 November to breathe was not that clean air, but in any case, not the aroma of rotten eggs. However, the source of the smell at the moment definitely not named. Urban services, prosecutors, environmentalists were involved in the investigation process. All the defendants deny any involvement possible "misconduct".

Listen to the testimonies of witnesses "gas attack", start thinking: we just live in one of the largest cities in the world or on the test site?

We can consider the most plausible versions:1. Leakage of hydrogen sulfide at the Moscow refinery in Kapotnya due to failure of treatment facilities.2. Korenovskii and Lyubertsy treatment facilities.3. The accident at the thermal power plants of Moscow.4. Another version is to drain butylmercaptan or other substances containing sulphur.5. Ejection of the mixture of gases in the industrial area "Rudnevo" or Moscow coke and gas plant.