Air pollution is a serious environmental problem. It is mainly caused by factories and cars releasing harmful gases into the atmosphere. These gases can cause respiratory problems and damage the ozone layer.
Yukarıdaki metne göre, hava kirliliğinin ana nedenlerinden biri nedir?
A) Ağaç dikmek
B) Geri dönüşüm yapmak
C) Fabrikalar ve arabalar
D) Suyu temiz tutmak
