To more fully understand how threshold limit value (TLV) relates to the work you're doing, here are some examples of where various industrial chemicals fit on the spectrum: TLV of 1,000 ppm or higher: ...
In 2013 the European Chemical Agency (ECHA) proposed threshold limit values for exposure concentration of hexavalent chromium, CR(VI), at workplaces in Europe which serve as a (non-legally binding). 1 ...