xmlns:atom="http://www.w3.org/2005/Atom" xmlns:atom="http://www.w3.org/2005/Atom"
6 kg per tonne of titanium dioxide produced as an annual average;
500 mg/Nm3 as an hourly average for plants for the concentration of waste acid.
5 mg/Nm3 as a daily average;
40 mg/Nm3 at any time.