I'm curious why you think that, Robert. I'm not an expert, but my impression is that tax treaties don't prevent taxation -- they only lay out what can and can't be taxed. So if you have tax liability in Thailand, you would subtract what you paid in taxes in the US, but if Thai tax is higher, you'd pay the difference.
Where did you get your information? I'm happy if it's true.
the US doesn't provide income affidavits. However, you should be able to start out with 800k in the bank and during that first year, transfer 65k in every month, from the US. For your second year, you can continue the monthly transfers and do whatever you want with the 800k. But for the first year, you must meet all the requirements of the banked funds method, and you must have 12 monthly deposits, one each month of 65k or more to switch.
An additional note -- you'll also be a tax resident of Thailand if you stay here for more than 180 days in a year. Thailand and Canada have a tax treaty, but I'm not sure of the details.
Air pollution is a risk factor for lung cancer, emphysema, heart disease, stroke, and dementia. Some of these may not have obvious warning symptoms so no one can say 'it doesn't affect me'.
The air quality isn't what I'd call good the rest of the year. It's average. Historical data is out there for anyone who wants to research.