Most air pollution in US and Canadian cities is caused by __________.
A.
logging and clear-cutting
B.
water runoff from farms
C.
mining for minerals
D.
vehicle and industrial emissions
Most air pollution in United States and Canadian cities is caused by vehicle and industrial emissions. The correct option among all the options that are given in the question is the fourth option or option "D". This has led to increased amount of global warming. I hope the answer has helped you.
