AUTHOR=Varotsos Costas A. TITLE=The grand challenges to air pollution JOURNAL=Frontiers in Environmental Science VOLUME=1 YEAR=2013 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2013.00003 DOI=10.3389/fenvs.2013.00003 ISSN=2296-665X