According to a World Bank report on environmental conditions in 21st - century China, a resident of Beijing is subjected to about seven times more
particulates than a resident of Los Angeles and about eight times as much sulfur dioxide.
Between 1998 and 2011, scientists followed more
than 66,000 Hong Kong
residents, who were at least 65 years old at the time of enrollment, and their exposure to
particulate matter with a diameter of 2.5 micrometers or less.