Even in a city like Houston, which has a uniquely large network of air quality monitors, pollution hotspots can easily be missed due to constraints on how many monitors are present and where they’re allowed to be installed. And this disproportionately affects marginalized communities, who are far more likely to live near pollution sources. So, a team of researchers – led by Sally Pusede, a UVA assistant professor of environmental science – used satellite data to measure these disparities.