The main components of smog are nitrogen oxides,
volatile organic compounds, peroxyacytyl nitrate and tropospheric ozone. Smog
is a mixture of air pollutants which are altered due to exposure to sunlight.
You inhale when contracting muscles and exhale when finishing a rep.
True ........................
It should be 10% sorry if im wrong :(
I believe it's either a or d, sorry I cant be of more help.