I never go on wikipedia, I talk only about what I know ,.and what I see . I've been living in northern Thailand for more than 20 years , so I don't need you to teach me about it .
you must be joking : Myanmar and Laos have a very long border whith the Golden Triangle(Thai side) , a few hundreds of km . With only the MEKONG river in between ! pollution doesn't really care about crossing over the river as big and wide it is .and satellites vision can easyly trace those ashes and P.M. 2,5 going down to Chiang Mai , and stay there being enclosed by the surrounding mountains
. People living in Chiang Mai know about
this , and I don't see any reason to say about it ,if it wasn't true.
About the tribes leaving in Yunan ,I bet you've been there lately to verify they don't burn.if you read well you'llnotice I disn't mention Vietnam (which you use to justify your statement ) of course in the said season the winds don't really blow from east to west ..and Vietnam isn't really north of Thailand 🤣🤣
Being urbanised has nothing to see with pollution in Chiang Mai .
The problem is The daily amount of P.M. 2,5 !!!
A big part of these P.M.2,5 , Comes from burning in China, Mianmar, Laos , and also some burning in northern Thailand. During a season when the winds blow from the north 😁