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Monday 25 April 1994 23:02 BST

TOP 10 AIR POLLUTANTS

1 Smoke

2 Sulphur Dioxide

3 Carbon Monoxide

4 Hydrocarbons

5 Lead

6 Nitrogen Dioxide

7 Benzine

8 1.3-Butadiene

9 PN10

10 Dioxins

Chart supplied by National Society For Clean Air

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