What is cotopaxi? where is it located?

Cotopaxi, Colorado 81223Cotopaxi is one of South America's most famous volcanoes and one of its most active ones. With its 5911 m it also ranks among the world's highest active volcanoes (26th highest). 
The majestic, snow covered symmetrical stratovolcano is located on the Eastern Cordillera of the Ecuadorian Andes, 60 km south of Quito and 35 km northeast of Latacunga. 
Cotopaxi's steep cone has nested summit craters, the outer of which measures 550 x 800 m in diameter. 

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”