Air conditioning is a fantastic invention as it allows to remain cool when temperatures are reaching 30°C and even 40°C. However, in many buildings around the world, the A/C is not set at the right temperature. As the New York times noted :
“Without fail, every year since moving to Hong Kong, I get a really bad cold. (…) “Oh, it’s quite common this time of year,” my doctor told me. “Everyone gets sick.” He was referring to the time of year that Hong Kong cranks up its air-conditioning. “
I have read that the same situation occurs in Singapore. I have witnessed it first hand in Europe as well. Others have told me about such a situation in America. This is a widespread phenomenon.