Valsts valodas centra izstrādātie ķīmijas un ķīmiskās tehnoloģijas termini

Konteksts: [..] Exposure to a concentration of lead in air greater that 40 ?g/m3, calculated as a time-weighted average over 40 hours per week [..]
Avots: Council Directive 82/605/EEC of 28 July 1982 on the protection of workers from the risks related to exposure to metallic lead and its ionic compounds at work (first individual Directive within the meaning of Article 8 of Directive 80/1107/EEC)