An independent guide to living in — and moving around — Chicagoland.
Researched from public data and local sources · How we work
-
Chicago Measures Its Own Air Now: 286 Sensors, 2,544,089 Hourly Readings — and 96 Percent of Its 100-Plus PM2.5 Hours Landed on Two July Dates
Chicago runs its own air-sensor network now: 286 sensors carrying all 77 community-area names, 2,544,089 hourly readings since July 2025, read whole. The PM2.5 record book belongs to two UTC dates -…
The Latest
Start with the data
From the Data Desk
Every new piece shows its sources and its dates. If we get something wrong, corrections come first — tell us. Published by TAK Marketing, LLC · Part of the fabulous Omnishun information systems · Editorial policy · Data & methods