RE: Air quality in Vienna got significantly better in summer, but PM 2.5 (particulate matter) levels still more than double the WHO guidelines.

This is the air condition here in my town, this is considerably a small town actually, pretty bad considereing it is a small town compare to the capital city of yours.
but most of us usually choose AC, as it is mostly hot here in my place, and the awareness of air pollution here in my country is not that much.