I was born and brought up in India as a teenager after which my family moved to USA.

Now whenever I go back to India with my family, someone always will end up getting sick. If you go out during the day time you can feel a layer of sticky stuff starting to cover your face and eventually more dust and air pollutants stick to your body. After you get back indoors if you take a white towel and just rub it gently on your face you will see amount of black dirt that comes off. I hope India takes steps to move forward with clean and renewal energy sources because they can have serious consequences on health of all Indian Citizens.

If I take the tops and doors off my Jeep and drive for any length of time, this happens to my hair and skin even here in California. I keep a supply of Lava on hand, because regular soap does not even begin to clean my hands after a day of driving like that. I recently discovered that sunblock makes the soot "stick" (logically) so now I have to scrape my skin for about ten minutes in the shower. Washing my hair looks like I'm rinsing off a palette of black paint on particularly bad days or days where I spent a lot of time on the freeway to get to where I was going.

Counterintuitively, I get far dirtier traveling to the trail with my Jeep stripped than I do actually running the trail. Even dusty ones. I tend to keep it buttoned up now.

Pollution sucks everywhere. I'm not making a claim whether it's better or worse anywhere or disagreeing with your comment, just making an observation. (And yes, I'm aware the hobby I'm mentioning in this comment contributes. I offset it when I can.)