Yup, a serious issue indeed. I've been led to beleive that the higher the chimney, the more potentially dangerous the smoke is.... dunno how true it is though. What really gets my goat about Smokin' Stack pictures is the ones the Campaigners use where they show the big round power station chimneys with the smoke pouring into the air - usually 4 or 5 of them together. What they fail to tell you is these stacks are giving off nothing bure steam. Yep, just the same as you putting your kettle outside and letting it boil. Oh, and they talk about car fumes? Spilling a drop of petrol on the forecourt as you take the nozzle out apparently gives off more pollution than driving your car 50 miles..... This pic? chilly!! Add to that the general underlying tone of the pollutant, and it sends a shiver down yer spine! (",)