“…Air pollution with particulate matter from anthropogenic sources worries both the scientists, the authorities, and the regular people. A permanent concern for the reduction of particulate pollution is also provided by industrial units that in order to meet the requirements for emissions and ambient air imposed by the authorities apply the best manufacturing technologies (Danciulescu et al 2018) along with the techniques for reducing particulate emissions (Bucur & Danet 2016, Danciulescu et al 2015, Danciulescu et al 2017. In urban areas, particulates come mainly from industrial emissions, transport, energy industry, natural sources, and gas-particle conversion processes, generally having higher mass concentrations than in rural areas; the particulates usually contain also significant quantities of specific pollutants such as heavy metals or organic compounds (Bucur et al 2018, Bratu et al 2016, Bratu et al 2018.…”