At least peak air pollution seems to have been passed, so it'll only get better from here (it's still a long way down though). The situation at the moment is a

At least peak air pollution seems to have been passed, so it'll only get better from here (it's still a long way down though). The situation at the moment is a bit difficult in that reducing some of the emissions will actually result in more pollution, since the pollutant mix undergoes chemical reactions and some components deplete others.