World's most polluted cities -- list of global cities with the most particulate matter in the air

We encourage you to have a look around the catalog first to see what we're all about before posting your first thread. Topics typically posted here include:

>Outdoor recreational activities (Hiking, trail running, bushwhacking, camping, spelunking, geocaching, orienteering, expeditions, urban exploration, backpacking, etc.)

>Gardening, farming and related activities

>Hunting and fishing, and other activities involving the stalking or taking of game (including bird-watching)

>Outdoor survival, bushcraft, foraging, self-sustenance in nature, train-hopping, hoboism, etc.

>Outdoor destinations and exploration (specific trails, parks, regions, etc.)

>Water-related activities (boats, diving, etc.)

>Outdoor philosophy (conservation, Leave No Trace, protectionism, etc.)

>Outdoor building and living (cabins, huts, treehouses, etc.)

>Outdoor social activities and organizations (meet-ups, Scouts, NOLS, etc.)

>Gear related to any of the above topics

Most topics related to the outdoors are fine. Write properly, behave politely, encourage a respectful community, and most importantly, GO OUTSIDE!!