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Earth and Atmospheric Sciences Professor Jennifer Glass comments on a paper recently published in Science that details “photochemodenitrification,” a nitrous oxide production pathway through which sunlight induces substantial and consistent nitrous oxide formation under oxic abiotic conditions in fresh and marine surface waters. 

“I think it’s a beautiful [study],’ says Glass, noting that researchers have previously shown similar light-driven processes in atmospheric aerosols, but never in aquatic environments. “As we’ve been sequencing more and more genomes in the environment a lot of us have moved really into that -omics space, looking for key markers for genes … This just goes to show that sometimes it’s not biological,” she says. “You have to think outside the box and consider all the chemistry that can be happening, not just the enzymes.”

Nga Lee "Sally" Ng, a professor in the School of Earth and Atmospheric Sciences and the School of Chemical and Biomolecular Engineering, leads the U.S. National Science Foundation-supported Atmospheric Science and Chemistry mEasurement NeTwork (ASCENT), which includes 12 air quality measurement sites nationwide. Each site has state-of-the-art instruments that help us understand aerosols, or tiny particles in the atmosphere. The network is constantly analyzing the chemical constituents of aerosols with a diameter smaller than 2.5 micrometers, referred to as PM2.5, which contribute to more than 90% of the adverse health impacts associated with air pollution.

"We provide ASCENT data to the public in real time so that people know what's in the air we're breathing," Ng said.