Every reference with a DOI in the deposited reference list resolved to a known
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Long-Term Exposure to Ambient Air Pollution and Respiratory Disease Mortality in Shenyang, China: A 12-Year Population-Based Retrospective Cohort Study
Traffic density and stationary sources of air pollution associated with wheeze, asthma, and immunoglobulin E from birth to age 5 years among New York City children
Carbon in Airway Macrophages and Lung Function in Children
The 6 references without a DOI — listed, not checked
no DOI — not checkedWorld Health Organization. Health effects of transport-related air pollution. Copenhagen: WHO Regional Office for Europe; 2005. p. 53–67.
no DOI — not checkedBrunekreef B, Beelen R, Hoek G, et al. Effects of long-term exposure to traffic-related air pollution on respiratory and cardiovascular mortality in Netherlands: the NLCS-AIR study. Res Rep Health Eff Inst. 2009;139:5–71.
no DOI — not checkedBeijing Municipal Bureau of Statistics. Beijing statistical yearbook 2014. Beijing: China Statistics Press; 2014. p. 56–69.
no DOI — not checkedBeijing Municipal Environmental Protection Bureau. Beijing Environment State Bulletin. 2014. http://www.bjepb.gov.cn .
no DOI — not checkedMinistry of Environmental Protection of the People’s Republic of China. Exposure factors handbook of Chinese population (adults). Beijing: China Environmental Sciences Press; 2013. p. 12–44.
no DOI — not checkedWorld Health Organization. Health effects of black carbon. Copenhagen: WHO Regional Office for Europe; 2012. p. 23–33.
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