China acknowledges the concerns and notes that it uses a different system to measure air pollution . U.S. readings show `` hazardous '' air while China reports `` slight pollution '' China 's readings do not include fine particles . Comment: Beijing 's weather has compounded the problem in recent days .
U.S. readings show `` hazardous '' air while China reports `` slight pollution '' China 's readings do not include fine particles . Comment: Beijing 's weather has compounded the problem in recent days .