2. Smog is one of current environmental problems in big cities.

3. 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

4. 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

5. Areas affected Smog 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.

6. 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

7. Statistics Incidents 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

8. Beijing Bangkog Thank you for your attention by Justyna Mróz Marzena Pawlik Paulina Sacała January 2009