In this article it discusses the problems of air pollution. "From 2008 to 2013, the WHO compared
air quality readings from 795 cities in
67 countries for levels of small and fine particulate
matter, which includes sulfates,
nitrates, and black carbon. These pollutants
penetrate deep within the lungs and the
cardiovascular system, increasing the risk of
stroke, heart disease, lung cancer, and
chronic and acute respiratory diseases such
as asthma". Air pollution is ignored and not noticed in poorer areas. Poorer communities suffer more health problems from air pollution.
https://jamanetwork-com.hmlproxy.lib.csufresno.edu/journals/jama/fullarticle/2533515
file:///C:/Users/amber_000/Downloads/jwm160017.pdf
https://jamanetwork-com.hmlproxy.lib.csufresno.edu/journals/jama/fullarticle/2533515
file:///C:/Users/amber_000/Downloads/jwm160017.pdf