648221 external_news 1624032694 1624032694 When the pandemic shutdown began in spring 2020, causing a sharp reduction in traffic — and with it, a decrease in nitrogen oxide emissions worldwide — researchers like Sally Ng, associate professor in the School of Earth and Atmospheric Sciences and the School of Chemical and Biomedical Engineering, saw a unique opportunity. "This opportunity provides us a way to take out one ingredient and look at the consequences on the other pollutants in the atmosphere," Ng says. 

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