Derek Day

Research Associate III
Fort Collins, Colorado
National Park Service (NPS)


Derek Day received BS and MS degrees in 1990 and 1992 respectively from Northern Arizona University. Both degrees were related to chemistry and environmental science. My areas of interest include the formation, transport, and impacts of ambient aerosols. I’ve worked at CIRA since 1992 and been involved in several large field campaigns at national parks investigating the physical, chemical, and optical properties of ambient aerosols. My particular area of expertise is aerosol light scattering as a function of relative humidity.

Recent Work

March 13, 2014

The figure shows data from smoke aerosols. The left hand plots show relative chemical composition from electron microscopy, while the right hand plots show aerosol particle growth as a function of humidity as measured by nephelometry. Note the top set ...