Scary.
I have a business in Chiang Mai near a major road. It's scary to see the pollutants (in this case from traffic) settling on my car each and every day. I'm 44 and breathing this air every single day.
Fun fact: I rinse my driveway every other day to get rid of the pollutants, in my opinion, diesel soot. The way my driveway is sloped it all ends up at one particular tree. That tree is now dying, whereas similar trees are thriving.
If it's killing the tree its probably killing me.
Another fun fact: my business is on the Chiang Mai moat.