Four science instruments at Delta Junction, Alaska, have begun gathering air quality data as part of a multi-state project to determine the chemical content and physical properties of airborne particulate matter. The Delta Junction site, one of 12 in 10 states, is managed by associate professor Jingqiu Mao of the University of Alaska Fairbanks Geophysical Institute and College of Natural Science and Mathematics. Nga Lee “Sally” Ng, professor in the School of Earth and Atmospheric Sciences, is the lead investigator. The instruments began operating June 26. The $12 million project, funded by the National Science Foundation, has created the nation’s first long-term network of monitoring stations on aerosol chemical content and properties.