Her research investigates how active volcanoes affect their environment and impact global climate change.

[6] Rymer looked to track the volatile flux of the Mount Etna, Masaya and Poás volcanoes by monitoring the volcanic plume and environmental sinks.

[14] She began a citizen science project with Earthwatch on Masaya volcano in Nicaragua in 2008, and has used this to engage members of the public in earth monitoring.

[1] Volunteers use Global Positioning System (GPS) sensors to monitor for volcanic gases and devices that collect geoelectric information.

[8] Whilst monitoring the Poás Volcano, information from the citizen scientists helped the National Park officials restrict access to the crater during the 2009 degassing.

[8][14] She developed a molecular biology test to monitor the hairs of Tradescantia pallida, where volcanic pollution can cause a visible mutations of a recessive gene that can cause chromosomal damage in pollen.

[8] Her group also use inductively coupled plasma mass spectrometry to study the concentrations of heavy elements in plant material.