A pair of researchers at the University of California, Berkeley, has used satellite observations as a way to measure the lifetime of nitrogen oxide (NOx) levels above multiple North American cities. In their paper published in the journal Science, Joshua Laughner and Ronald Cohen describe how they used a decade’s worth of satellite imagery to measure NOx levels over 49 American cities, and what they found.
Click here for original story, Satellite observations measure nitrogen oxide lifetimes above multiple North American cities
Source: Phys.org