Concentrations of some pollution indicators can be 2-5 times higher indoors compared to outdoors. Polluted air is the number one environmental cause of premature mortality, contributing to 200,000 premature deaths annually in the United States alone and approximately seven million, or one in eight, premature deaths globally.
WELL establishes requirements in buildings that promote clean air and reduce or minimize the sources of indoor air pollution.
The World Health Organization estimates that 12.7% of deaths could be prevented by improving air quality globally. Decreased air pollution could reduce the burden of respiratory and cardiovascular diseases, health-care costs, workforce productivity loss due to illness and increase life expectancy for local populations.