3.
IED
For gaseous sulphur dioxide and trioxide discharged from digestion and calcination, including acid droplets calculated as SO2 equivalent: (a) 6 kg per tonne of titanium dioxide produced as an annual average; (b) 500 mg/Nm3 as an hourly average for plants for the concentration of waste acid.
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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2024-08-04; changes after this date are not shown.