'Roving sentinels' discover new air pollution
<p>The researchers loaded <a href="https://unews.utah.edu/google-cars/">the vehicles</a> with air quality instrumentation and directed drivers to trawl through neighborhoods street by street, taking one air sample per second to create a massive dataset of air pollutant concentrations in the Salt Lake Valley from May 2019 to March 2020. The observations yielded the highest-resolution map yet of pollution hotspots at fine scales—the data captured variability within 200 meters, or about two football fields. Air quality patterns were...