Beijing temperatures are nowhere near the upper 90's & 100's, which we get in the American South. And yes, wearing a mask over your nose and mouth can increase your risk of heat stroke. This is obviously a topic you know little about. You don't seem to be from an area that has to deal with extreme summers.
Beijing 2019 in July.
https://www.accuweather.com/en/cn/beijing/101924/july-weather/101924?year=2019
Average: 32.7
Orlando 2019 in July.
https://www.accuweather.com/en/us/orlando/32801/july-weather/328169?year=2019
Average: 32.9
Another fun fact, masks are becoming common in New Delhi due to pollution. Their average temperature for APRIL of last year? 37.6 - almost 5 degrees higher than Orlando's summer high.
As for your claim of heat stroke, let's examine the facts shall we?
Now for starters, common sense alone tells us that if your claim was real, then people wearing masks in the summer (which people do all over the world for a variety of reasons, including medical, yes, even in the US, but we'll continue to focus on Asia since it is more common there) would be dropping like flies of heat stroke, and the usage of masks in summer would cease to be recommended. And yet - they don't.
But moving on...
Fact 1: Heatstroke is a condition caused by your body overheating, usually as a result of prolonged exposure to or physical exertion in high temperatures. This most serious form of heat injury, heatstroke, can occur if your body temperature rises to 104 F (40 C) or higher.
It is caused by an actual change in core body temperature, NOT perceived temperature.
Fact: surgical face masks (the type expected to be worn in public, due to the costs associated with N95s) do not significantly impact core temperature.
https://www.google.com/url?sa=t&sou...FjACegQIARAB&usg=AOvVaw0emXmjTunSCbhmiacuHRzQ[/URL]
Give it a read. A study done in Hong Kong during the SARS outbreak, determining the effect wearing a mask had on body temperature. For the record, Hong Kings average temperature in July was 32.
As for the results, N95s affected oral temperature, but the surgical masks had little to no affect. The increase in aural temperature for the N95s was of "no clinical significance". At the end you'll notice that they said even for the N95 masks, the oral temperatures never rose above 38 (100.4), which is the medical threshold for fever. And only 5% of people even rose above 37.5 (99.5).
Aural rose even less which implies a clinically insignificant effect on core temperature. But even if the core temperature did rise to 37.5, that temperature is not even close to being high enough to cause heat stroke.
So let's try to move away from unfounded hysterical claims shall we?
Oh, and just for the record to address your claims that I "lack knowledge" because of where I live... yes I live in Canada. However, in my area of Canada while not sustained all summer, we always get temperatures at some point in the high 80s and 90s with humidity levels equal to or HIGHER than Florida's, which create dangerous heat indexes pretty much on par with what Disney sees. My husband, a former contractor, spent many a summer working during those days wearing N95s and respirator masks doing reno's - and guess what? No heat stroke.
Have a good day.