Пожалуйста сократите этот текст выделив главную идея пж.The most important environmental

Пожалуйста сократите этот текст выделив основную мысль пж.
The most important environmental problem In my city is high atmospheris pollution. Exhaust fumes from vehicles and chemical, metallurgical industry enter the air. Experts say that every year the level of emissions of harmful substances increases. The maximum allowable emissions are exceeded twenty times. Among the most dangerous substances polluting the atmosphere, the following : nitrogen, carbon monotid... If the city is very dirty air people be threatened with extinction. Solution: make less Air wastes into atmosphere and plant many trees for the cleaning atmosphere