If we have a more developed subway system and public buses , it 's not difficult to control the number of cars . '' 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 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 .