# Which of the following is primary pollutant(s)

$(1)\;Ozone\qquad(2)\;SO_2\qquad(3)\;SO_3\qquad(4)\;NO_2\qquad(5)\;PBN$

$(a)\;1,3,5\qquad(b)\;2,4\qquad(c)\;1,2,4\qquad(d)\;3,4,5$

$SO_2$ and $NO_2$
Hence (b) is the correct answer.
answered Jan 20, 2014