BOULDER, Colorado, Aug. 2 (TNSres) -- The Cooperative Institute for Research in Environmental Sciences issued the following news: * * * CIRES researchers take part in national project to identify sources of pollution * * * Standing on the roof of a small rectangular building among instruments and sensors, CU Boulder chemistry PhD student Seonsik Yun tinkers with shiny scientific equipment and sample air inlets that lead to instruments inside below. The air quality sampling site, La Casa, hou  more