Media type: E-Article Title: Evaluation of Local Scale PM Pollution Levels in Typical Street Canyon in Riga Contributor: Steinberga, Iveta; Bikshe Jr., Janis; Kundzins, Karlis; Kleperis, Janis; Bikshe, Janis imprint: Scientific Research Publishing, Inc., 2013 Published in: Journal of Environmental Protection Language: Not determined DOI: 10.4236/jep.2013.49110 ISSN: 2152-2197; 2152-2219 Origination: Footnote: Access State: Open Access