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    • Ultrafine particles in cities 

      Kumar, Prashant; Morawska, Lidia; Birmili, Wolfram; Paasonen, Pauli; Hu, Min; e.a. (Elsevier, 2014-02-04)
      Ultrafine particles (UFPs; diameter less than 100. nm) are ubiquitous in urban air, and an acknowledged risk to human health. Globally, the major source for urban outdoor UFP concentrations is motor traffic. Ongoing trends ...