air pollution of guangzhou china

air alarm architecture asia asian bad breath building canton china chinese city cityscape construction contamination damage day development dirty downtown earth economy emission environment environmental factory fog gas global guangzhou hazard hazardous haze health healthy high landmark landscape metropolis mist modern morning pearl peking people plane pollute polluted pollution population port problem protection scene shanghai ship sightseeing sky skyline skyscraper smog square street tour tourism tower travel traveling unhealthy urban view warming yangtze