Turin is a city and an important business and cultural centre in northern Italy. The population of the urban area is estimated by Eurostat to be 1.7 million inhabitants. The city is located mainly on the western bank of the Po River, subject to heavy pollution caused by heavy smog due to industrial atmospheric emissions. Recently the institutions declare emergency for the air pollution. Many trees live in the middle of the city, taking an interesting point of view, higher and longer than human vision.