YDS CÜMLE ATMA / TEST 5 3. Soru

3.

(I) Under certain weather conditions a blanket
of still, warm air forms over cooler air close to
the ground. (II) This traps air pollutants
that would normally be carried away from the
city. (III) Sometimes such conditions persist
for more than a few days. (IV) In that case,
dangerous and even deadly concentrations of
pollutants, that is smog, build up. (V)Dense
traffic in big cities, besides pollutants
from industrial places, also adds
significantly to the problem of smog.