So when there is a day of zero economic activity, pollution is much lower... but not for long. The story is misleading because over the long term, mobility is a tremendous factor in economic growth. And the money created through a booming economy allows rich countries to clean the air through expensive environmental laws (such as auto and power plant emissions controls). This is why car-friendly U.S.A. has cleaner air than Europe and Asia. (There are localized exceptions). Mobility also leads to less costly freight deliveries and more consumer choices for purchases.
U.S. sanctions Russia's state-owned arms exporter Rosoboronexport (Reuters)
from the article: Report: Air pollution 100 times lower during Yom Kippur