In 2011, Farmer joined the Colorado State University. Farmer studies outdoor and indoor atmospheric chemistry. She looks to understand the sources and sinks of trace gases in the atmosphere. She spent 2014 as a Resident Fellow in the Colorado State University School of Global Environmental Sustainability.
Farmer studied the impact of wildfires on air quality. She used data from the Atmospheric Radiation Measurement Southern Great Plains observatory. She made her measurements using an ultra-high-sensitivity aerosol spectrometer The spectrometer uses a laser to determine the size of aerosol particles.
During the COVID-19 pandemic, Farmer studied the quality of indoor air.
Farmer was awarded the American Geophysical Union Atmospheric Sciences Ascent Award in 2022.