They only work with the windows closed, unfortunately … which, depending where you live, means you’d also need AC, which might spike up your electricity bill, etc …

That only works if everyone does it … I don’t use wood fires or coal BBQs and don’t own a car, but all my neighbors do :(

Wow, I always thought Barcelona (where I live) was much worse, turns out it’s just a bit worse … clocking in at 17μg right now … sometimes up to 40, esp. in the Summer.

I really wish Barcelona would follow this example … it’s not that hard to stay clear of the tourists if you avoid the Ramblas, but the pollution spreads through the air and it really does some damage. Supposedly it’s not even like this type of tourism brings in a lot of money …