Traffic moves through dense smog in Beijing.<br/> <br />Air quality is hitting hazards levels as people brace for a long winter<br/> <br />Beijing suffered a smog emergency last winter and many fear that such conditions could return.<br/> <br />Authorities are hoping for relief Sunday expecting high winds to provide relief.<br/> <br />Meanwhile fog is blanketing much of northern, central and eastern China.<br/> <br />China is the world's biggest greenhouse gas emitter and is heavily reliant on coal.<br/> <br />As winter comes air quality could get worse with public heating systems offering relief from the cold -- while adding to the smog.
