Chicago Police Superintendent Larry Snelling is retiring after being in charge of CPD for less than three years. Mayor Brandon Johnson is urging Chicagoans to be cautious this holiday weekend as a Midwest heat wave finally starts to let up. The Chicago Cubs crushed the San Diego Padres Wednesday, putting up a whopping 23 runs.

Plus, Chicago is now home to the largest local network of air quality sensors in the country. In a single day, the city-spanning network captures over 20,000 data points, revealing disparities in air quality from neighborhood to neighborhood. It’s about to be put to the test during its first Chicago summer, which is the season when air pollution tends to worsen, partly due to climate change.