smog city from pm 2.5 dust. cityscape with bad air pollution, pm 2.5 concept, in kuala lumpur, malaysia

air allergy bad building cancer carbon city cityscape climate concept dangerous dioxide disease dust environment factory fog frustrated global hazard health heart industry kuala lumpur lung malaysia mist outdoor particle people pm10 pneumonia polluted pollution problem protection quality respiratory risk serious smog smoke symbol text thailand toxic trouble unhealthy urban warning