Air Pollution (1968)

London. L, S over London on a grim, grey day; pan right to show apparatus in the Medical Research Council s air pollution research unit at St Bartholomew s Hospital. Various tests and experiments are seen, conducted by scientists in white coats to test levels of pollution and the harmful effects. One scientist sits in a room that is filled with (invisible) smoke; he coughs and sputters, then is let out and put in an enclosed glass box, where he puts on a nose clip and breathes into a special machine. Another man breathes heavily into a tube while a graph marks the effort of his lungs. A man breathes in diluted carbon monoxide through a huge breathalyser, then does a simple test to see how quick his reflexes are by pressing on an electric pad with a wired pen. M, S of a man smoking; he stubs out his cigarette then walks through a door reading No Smoking. A scientist inside takes a pinprick of his blood to test levels of carbon monoxide in his blood. C, U of three cigarette stubs, one still smoki