Detroit and Chicago are in the lead in a world rating of the cities with the dirtiest air

The American Detroit (State of Michigan) and Chicago (State of Illinois) took the two first places in a world rating of impurity of air. It follows from data of a portal of IQAir which publishes an anti-rating of quality of air. As of 20:00 on June 27 (03:00 on June 28 Moscow time)...