Chart one depicts the number of days out of the year that the county's Air Quality Index (AQI) exceeded 100
AQI 100 on all Unhealthy Days

The City of Evanston has inventoried and maintains over 34,000 trees located on City property and in the parkways.

This layer shows bodies of water in and around the City of Evanston. The chief among these is Lake Michigan to the east with 4.25 miles of shoreline. The data also includes 3 miles of the North Shore Channel, the 14.2 acre Northwestern Lagoon, and various other ponds.

The City of Evanston maintains 76 of its own parks spread over 273 acres. This parks layer also includes 10 Ridgeville Park District parks, 2 Lighthouse Park District Parks, 1 Cook County Forest Preserve (Perkins Woods) and the portion of the Canal Shores Golf Course within the City of Evanston as well as 2 parks just over the city's western boundary which we jointly operate with the Village of Skokie.