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| Graph by Martha Klang McGill |
Urban Pollution has a major impact on the health of cities' populations and is also a good indicator to the level of combustible engine congestion on the city's road network. Of course, there are issues of industrial activity in the city and also the local climate, but there is no doubt that more focus on a sustainable transport network based on clean energy sources can dramatically improve the air quality of cities such as LA and Houston, Texas.