下列哪组气体都属于空气污染物（）

A．	$C{H_4}_{、}C{O_2}_{、}{H}_2$	B．	$C{O_2}_{、}HC{l}_{、}{N}_2$
C．	$S{O_2}_{、}C{O}_{、}N{O}_2$	D．	$HC{l}_{、}{N_2}_{、}{O}_2$