Article 4

Without prejudice to Article 3, Member States shall take the measures necessary to ensure that the concentration of asbestos emitted through the discharge ducts into the air during use of asbestos does not exceed a limit value of 0,1 mg/m3 (milligrams of abestos (SIC! asbestos) per m3 of air discharged).

Member States may exempt from the obligation referred to in paragraph 1 the plants emitting less than 5 000  m3/hour total gaseous discharges, where the discharge of asbestos into the air is not more than 0,5 grams per hour at any time under normal operating conditions.