Dan, Israel is only a small country and has not enough space for nature and city/car free areas. Where can Israeli's go to escape the pollution ? Not many options here, the Negev?. In the US of A it is easy to get away from urban live and enjoy nature and fresh air, not in Israel.
U.S. defense contractor accused of copying secret military documents (Reuters)
from the article: Report: Air pollution 100 times lower during Yom Kippur