comparing with the past, the ecology in Moscow became worse due to the fact that new factories appeared, the number of machines increased

Источник: http://ecology-of.ru/eko-razdel/problemy-s-ekologiej-v-rossii-istoricheski-slozhivshiesya-i-vnov-voznikshie

The ecology of Moscow has deteriorated from what it was in the past, due to the advent of new factories and an increase in automobiles.

Comparing with the past Moscow ecology has become worse due to new factories and a growing number of vehicles.