Lithuanian state air monitoring measurement data (semi-automatic sampling) Measurements was carried out at 5 state-monitored air quality research stations: Vilnius, Žirmūnai (0003), Kaunas Petrašiūnai (0041), Klaipėda Centras (0031), Šiauliai (0022), Aukštaitija (0051). From the PM10 filters exposed for 1 week (air volume pumping 2.3 m3/h), in the laboratory analyzed and reported monthly average and average annual concentrations in the ambient air of the following heavy metals: Pb, As, Ni, Cd (units of measurement for lead is µg/m3 and for As, Ni, Cd accordingly ng/m3) and the following polycyclic aromatic hydrocarbons (PAHs): benzo(a)pyrene, benzo(b)fluoranthene, benzo(k)fluoranthene, dibenzo(a,h)anthracene, indene(1,2,3-cd)pyrene (units ng/m3). The results of the measurements are presented in accordance with the following legislation: 2008 May 21 Directive 2008/50/EC of the European Parliament and of the Council on ambient air quality and cleaner air for Europe (lead in ambient air measurements); 2004 December 15 Directive 2004/107/EC of the European Parliament and of the Council relating to arsenic, cadmium, mercury, nickel, and polycyclic aromatic hydrocarbons in ambient air.