You quoted them as doses not concentrations. Quite different __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb *Sent from my etch-a-sketch* On 24 April 2017 at 14:35, Sean Breheny wrote: > David, > > No - both of those figures are concentrations. It's not 50ug - it's > 50ug/m^3. > > Sean > > > On Mon, Apr 24, 2017 at 9:19 AM, David C Brown wrote= : > > > You would need 16 litres at 3mg m^-3 to be equivalent to the 50ug > > permissible dose. That is a helluva lot of solder smoke. > > > > __________________________________________ > > David C Brown > > 43 Bings Road > > Whaley Bridge > > High Peak Phone: 01663 733236 > > Derbyshire eMail: dcb.home@gmail.com > > SK23 7ND web: www.bings-knowle.co.uk/dcb > > > > > > > > > > *Sent from my etch-a-sketch* > > > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .