Traffic and pollution on motorway near the financial district of Xian, China

air pollution air quality automobiles busy roads carbon footprint china chinese chinese traffic city life city living congested congestion crowded diesel fumes east asia eastern stock image exhaust emissions far east fog foggy global warming heavy weight of traffic imported cars imports jams overcrowded overcrowding pollutants polluted air polluting environment poor air quality population explosion population growth rush hour rush hour shanxi slow moving smog smoggy smoggy day traffic conditions traffic jam traffic lanes transport transportation urban lifestyle volume of traffic car cars daytime driving full length full lengths horizontal journey journeys motorways outdoors outside over populated stock image stock photo stock photograph travel travel photo travel photograph travel photography travel stock travelling travels urban living travel destinations travel destination chinese stock image color image color colour tourism destination