SIR - Ironically, when shopping in Saltaire, I find people removing their face masks when they leave the shops. I keep mine on and would advise others do the same. The air quality around Saltaire Roundabout is not good. And we are far more at risk walking by roads like this than anything we can catch in a shop or a bus.

In this way, the masks are a good thing.

Alan Bates, Bowland Avenue, Baildon