It's good to get out for a breath of fresh air. But some people have to go a long way for it, because, as everybody knows, Britain's 'smokeless zone' programme is by no means yet complete.

Natural Gas, Britain's cleanest fuel, is going ahead at high speed-with great benefit to all.

In a few years' time it will not be so easy to take photographs as grim as this one.

There are quite a few areas where this kind of picture can still be taken. On the other hand the programme of conversion to

The sooner the better. Use Natural Gas-the smokeless fuel.