[viky79]

Which is correct
(1) Photochemical smog is oxidizing in character and is formed during winter
(2)  Winter smoke is reducing in  character due to absence of SO2 and carbon particles
(3)  Particulates of size about 2-3 microns can enter lungs directly
(4)  Prop-2-ene-1-al on oxidation with O3, NO2 forms PAN

[Borek]

Please read forum rules.

Don't cross post, show your effort, don't flood the forum with series of posts.

Some of your posts got deleted, feel free to repost following forum rules.