二氧化硫是我国当前大气中分布较广、影响也较大的主要污染物之一,时常以它作为大气污染的主要指标。在《环境空气质量标准》中,其一级、二级、三级的日平均标准分别为()。
A:0.05mg/m3,0.15mg/m3,0.25mg/m3
B:0.02mg/m3,0.06mg/m3,0.10mg/m3
C:0.15mg/m3,0.50mg/m3,0.70mg/m3
D:0.06mg/m3,0.15mg/m3,0.50mg/m3
出自:环境影响评价技术导则与标准