Telegraph: Enjoying the sun? I do hope so, not least because there is an extra reason to relish the best spell of good weather in seven years. Dangerous air pollution normally soars in such conditions, but so far we have largely escaped. Fresh, clean north-easterly breezes, blowing in off the North Sea, have dispersed it before it can build up.
Not that we have got off entirely scot-free, or will necessarily go on doing so well. On Wednesday, high pollution levels struck south-west London, for only the third...