Smog is one of current environmental problems in big cities.

What is smog?

Smog is a kind of air pollution. The word "smog" is

a mix of smoke and fog. Classic smog is caused by large amount of coal and oil burning

Health effects

Smog is especially harmful for senior citizens, children, and people with heart and lung problems such as emphysema, bronchitis, and asthma.

It can cause:• eye and nose irritation• coughing• shortness of breath• the increasing vulnerability to illnesses

Areas affectedSmog can form in almost any climate where

industries or cities release large amount of air pollution. It gets worse during periods

of warmer, sunnier weather when the upper air is warm enough to inhibit vertical circulation.

The most polluted cities in the world

London

New York

Cairo

Los Angeles

São Paulo

Mexico City

Santiago of Chile

Toronto

Athens

Hong Kong

Seoul

Beijing

StatisticsIncidents in the USA

• 1948, October 30-31, Donora : 20 died, 600 hospitalized• 1953, November, New York: Smog kills about 170 people.• 1963, New York: smog is blamed for 200 deaths• 1966, New York: smog blamed for 169 deaths

Beijing

Bangkog

Thank you for your attention by

Justyna Mróz

Marzena Pawlik

Paulina Sacała

January 2009