We have a need to move around, and fast. We move from one place to another, they bring us merchandise, food and a lot of other things but on the way the contamination takes over us.
Fumes, gases, particles, all affect our lungs and we breathe worse every day.
Public transport is very important in cities, as they make all movements possible, but we need it to be sustainable.
Walk, whenever you can, it is healthy and does not generate carbon dioxide, go cycling on the bike path, use other low-pollution means of transport and thus the city will be a better place for everyone.