Posted By paulw71 clay will produce silica dust which has a maximum exposure limit of 0.3mg/m3 over an 8 hour twa.

Posted By holmezy Paul, without wanting to sound like a clever so and so....but the wel for respirable crystalline silica is 0.1mg/m3 and has been for a few years. If you have a problem with RCS, as I do, then this makes a massive difference to the effectiveness of the controls you are applying ie LEV, RPE etc. As for construction generated dust, which is probably classed as nuisance dust, the only real answer is to damp it down and continually clean with roadsweeper type machines. Holmezy

Posted By steve e ashton Robert.. Mainly for related interest.. I read recently a report on the issues associated with unconsolidated roads in places like Africa - where road dust (which I take to be very similar to much 'construction dust') is seen as a significant health problem affecting mostly the poor in poorer countries (who don't tarmacadam their roads, and who live in houses without tightly fitting doors or windows...). Sorry I don't recall whether it was a BBC article or a World Health Organisation report, or a UNESCO paper or whatever. (There are Google references to papers on the subject from Academics in South Africa and in Los Angeles etc - but I don't think it was any of them....) But if you are interested in Construction dust in developing countries, be prepared to have some interest from unexpected quarters. It may just be 'nuisance dust' to you and I, but if you have to live eat drink and sleep in it 24/7, then the effects are going to be somewhat worse than for the average UK ganger. Steve