Many residents in Beijing have complained about worsening air quality . In November , Environmental Information Center ' ` ` slightly polluted '' U.S. Embassy in Beijing tweeted its real - time reading as ` ` hazardous '' Experts say Beijing 's use of PM2.5 shows the strength of public opinion .
Many residents in Beijing have complained about worsening air pollution . In November , Environmental Monitoring Center reported `` slightly polluted '' U.S. Embassy in Beijing tweeted its real-time reading as `` hazardous '' Experts say Beijing 's adoption of PM2.5 shows growing influence of public opinion .