Tests on levels and harmful effects of air pollution are carried out at the Medical Research Council.
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 smoking, in an ashtray.
Cuts exist - see separate record.