Local climate justice activists are using community-run air sensors to track pollution and push residents to connect air quality with health. When she contacted her doctor’s office to ask what might be causing them, a nurse told her to stay inside because of the poor air quality that day. The city recently installed a network of Clarity air sensors to track air pollution in vulnerable neighborhoods. Poor air quality affects all Chicagoans, but race and income affect who bears the brunt of day-to-day pollution. The group’s community garden flies a color-coded flag that indicates the air quality index, a tool used to identify which groups are most vulnerable to health effects from current air quality conditions.