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Over the last few years, EPA has consistently tightened its national ambient air quality standards (NAAQS) for particulate matter (PM), ozone and nitrogen dioxide (see related stories in the January issue of the ).  ÎÚÑ»´«Ã½ has closely tracked and weighed in on these rulemaking actions with an eye to what they may mean for future construction, including stricter requirements and/or restrictions on diesel engines and their use.  Follow ÎÚÑ»´«Ã½'s action by reading the entire Environmental Observer article .  For more information, contact Leah Pilconis at pilconisl@agc.org.