Question

Identify which of the following trace gases are (mainly) primary and/or secondary in origin in the TROPOSPHERE.

O₃ , NO_x , Isoprene, HNO₃ , CH₂O , α-pinene, HO₂ , CH_{4 ,} PAN, H₂SO₄ , SO₂ , BTEX

Answer 1

SOLUTION:

Among all given gases

O3 is the result of the reaction between O2 molecules and done by radical reaction.

So secondary origin

NOx also result of N2 and O2 so secondary

HNO3 is also formed during the reaction of nitrogen and H2O

So secondary origin.

CH2O is also secondary origin

Alpha pinene is found naturally and its primary origin

HO2 is secondary origin.

PAN : (Peroxyacytyl nitrate) This is formed from C, H, O, N

CH4 : Is formed in the nature in nature. So primary origin

H2SO4 : is formed form SO2 and H2O

So secondary origin.

BTEX is a derivative of other chemical so it is also secondary