A tourist wearing a face mask visits the Olympic Green in heavy smog in Beijing, China, 8 December 2015. A batch of smog that prompted Beijing to is Stock Photo - Alamy
Smog over Beijing, China, people wear masks, as air pollution takes over - ABC News (Australian Broadcasting Corporation)
Fear, Then Skepticism, Over Antibiotic-Resistant Genes in Beijing Smog - The New York Times
Face masks popular as Beijing air quality stays at hazardous levels | Air pollution, Beijing, China
Smog dents Beijing's expat appeal | Financial Times
China pollution: First ever red alert in effect in Beijing - BBC News
Photos: The smog that's choking Beijing as it faces the worst pollution of 2016 — Quartz
Beijing designer turns sneakers into smog masks[1]- Chinadaily.com.cn
China Smog Triggers Demand for Masks, Filters, but Hobbles Deliveries
Beijing Residents Are Using Smog Masks to Make Fashion Statements