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WikiPedia: Sương khói http://www.ausetute.com.au/photsmog.html http://www.npi.gov.au/database/substance-info/prof... http://www.tmr.qld.gov.au/Community-and-environmen... http://www.environmentalgraffiti.com/offbeat-news/... http://www.epa.gov/air/nitrogenoxides/health.html http://www.epa.gov/air/noxfacts.pdf http://www.epa.gov/air/ozonepollution/pdfs/smog.pd... http://www.epa.gov/cgi-bin/broker?_service=data&_d... http://www.epa.gov/cgi-bin/broker?_service=data&_d... http://yosemite.epa.gov/opa/admpress.nsf/6427a6b75...