"Mobile air quality monitoring in San Francisco and Oakland challenges the accuracy of stationary monitoring sites across the country"
"Finding the most polluted places in the San Francisco Bay area is simple, a new air quality analysis shows: Locate places where mostly Black, Latino, Asian and low-income residents live, and pay them a visit.
The data released Tuesday by Aclima — a California-based tech company that measured the region’s air quality block-by-block for the first time — found that communities of color are exposed to 55 percent more nitrogen dioxide, which contributes to smog, than mostly White communities.
While the Environmental Protection Agency gauges an area’s air quality with fixed monitors, the new survey unearthed more granular data by sending low-emission vehicles equipped with sophisticated technology to traverse neighborhoods at least 20 times each. These forays revealed that poor people of all ethnicities experience a 30 percent higher exposure to nitrogen dioxide compared to wealthier residents, and concentrations can vary up to 800 percent from one end of a block to the next."
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