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 <dcb.home@gmail.com> 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
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>
>
> *Sent from my etch-a-sketch*
>
>
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