The explanation to your question is in the photo. Hope this helps ^^
Answer:
Brown v Board of Education help get rid of segregation in schools
Explanation:
I wonder whether there would be also other options, but one very important aspect is the smog: the city center is where many industry-relevant things meet: the factories are all around it, transport, cars... and since it is surrounded by bad air, the air takes longer to dissipate. This is especially visible if the city is in a valley, such as Mexico city foe example.