Assuming you're either near a big road, or your city has a major problem with air pollution. I'm near a sort-of important road in a German city and I don't obse

Assuming you're either near a big road, or your city has a major problem with air pollution. I'm near a sort-of important road in a German city and I don't observe anything of this magnitude even though my windows are fully opened quite regularly. (Air pollution is not that bad in my city. Many other German cities are considering driving bans.)