Chemistry's James Donaldson reveals that sunlight releases pollutants back into the atmosphere
Much to his surprise, University of Toronto chemistry professor James Donaldson found himself a media star this month, thanks to urban grime.
Donaldson has been studying urban grime for over a decade. He recently presented research at the annual convention of the American Chemical Society detailing how sunlight triggers the release of smog-forming nitrogen oxide compounds from the dirt that builds up on buildings and statues in cities.
Previously it had been thought that these compounds remained “trapped” in the grime.