We have just returned from the first two Songkran days in Chiang Mai.
Absolutely NO PROBLEM of pollution in the town. Very few people using smog masks.
In the far distance the mountains looked misty.
We went to the Queen Sirikit Botanical Gardens in the foothills -- again no problem with pollution.
At the gardens, there was no problem with dual pricing for us -- the cashier at the entrance said "you two are so old you can go in for free!"
The only charge was 100 Baht for the car and driver.
Our only problem was the lack of gay bars without spending 300 Baht in a Tuk Tuk.
We spent every night in RAM BAR with it's fabulous shows and then next door to secrets Bar for a later drink.
Temperature at the moment reported to be 41. Yes it was bleedin' hot.
Are you speaking from personal observation kjun12?