Google's Street View cars now tracking air pollution
In partnership with the University of Texas, the search company mapped 78 square miles of Oakland over an entire year, collecting readings every 30 metres or so.
That's an extremely high level of detail - substantially greater than is possible with traditional static air quality monitors.
Most large urban areas have one air quality monitor for every 100-200 square miles.
"Air pollution varies very finely in space, and we can't capture that variation with other existing measurement techniques," said Joshua Apte, an assistant professor at the Cockrell School of Engineering and lead author of a paper describing the results that was published in the journal Environmental Science and Technology.
"Using our approach and analysis techniques, we can now visualize air pollution with incredible detail. This kind of information could transform our understanding of the sources and impacts of air pollution."
What surprised the researchers in the data is that there are locations that can be six times more polluted on one end of a city block than on the other. Hotspots included the port, busy traffic intersections, restaurants, warehouses, industrial plants and car dealerships.
"You could use this information when you're picking a school for your kids. Is there a school with a playground that might have better air quality because your kid has asthma?" Apte said.
"This hyper-local information about consistent air quality can be really useful for people, especially those who are vulnerable because of age or health condition." ■