Telegraph: Suddenly we are all hearing about air pollution. More than three and a half million especially vulnerable people, with heart and lung conditions, were advised to "avoid strenuous activity' yesterday as levels of tiny but dangerous particles in the air reached the maximum level on the Government's official scale. Even relatively healthy people were advised to "reduce physical exertion'.
Scores of flights were cancelled because of smog, and red dust -- swept up from the Sahara and carried by the...