日前，環(huán)保部發(fā)布第一季度全國74城市空氣質(zhì)量報告，超標(biāo)天數(shù)比例為55.6%，其中PM2.5的超標(biāo)天數(shù)幾乎達(dá)到一半。污染較重的前10個城市是唐山、石家莊、西安、成都、邢臺、保定、西寧、邯鄲、廊坊和太原，北京排名17位，空氣最好的是海口。

序號城市序號城市12345678910111213141516171819202122232425262728293031323334353637唐山石家莊西安成都邢臺保定西寧邯鄲廊坊太原烏魯木齊蘭州濟(jì)南衡水秦皇島天津北京南昌鄭州常州武漢長沙無錫南京滄州呼和浩特沈陽徐州湖州廣州重慶肇州揚(yáng)州蘇州東莞溫州佛山空氣質(zhì)量綜合指數(shù)7.936.936.926.816.706.526.115.985.585.385.295.245.185.174.924.844.804.594.524.464.384.334.334.294.234.224.154.134.094.084.084.084.024.003.993.953.9438394041424344454647484950515253545556575859606162636465666768697071727374杭州金華紹興銀川承德泰州鎮(zhèn)江昆明南通貴陽嘉興鹽城青島衢州上海合肥臺州南寧連云港寧波長春江門哈爾濱大連淮安宿遷中山張家口廈門深圳麗水珠?；葜莞Ｖ堇_舟山海口空氣質(zhì)量綜合指數(shù)3.943.913.843.823.773.763.703.693.683.663.613.603.603.533.463.413.383.333.283.283.273.263.233.233.233.223.103.073.073.022.972.952.912.512.472.231.61