Chicago publishes its own empty-seats file monthly from its personnel system. The August 31 snapshot: 1,310 vacancy-carrying position lines, 3,857 vacancies beside 22,464 filled seats on those same lines - POLICE OFFICER alone at 732, one fire-recruit line at 166, and two-thirds of the file one empty chair at a time. No citywide rate, because the file lists only lines with vacancies - a boundary this page keeps on every number.

Since February 2022 Chicago has measured respiratory viruses in its sewers at seven sewershed sites, weekly. Read whole - 6,692 rows, 237 weeks - the file shows four very different ledgers: SARS-CoV-2 with 51 Very High weeks, Influenza B with exactly one, RSV peaking the week that straddled New Year 2024 - and every virus at Minimal in the newest week. Concentrations, never illness counts; every caveat quoted from the file itself.

The TIF annual reports now publish a deal-by-deal jobs scorecard: projections beside actuals for every subsidized redevelopment agreement. Read whole - 110 rows, 2022-2025 - the 2025 reports project 1,688 permanent jobs with 543 in the actual column so far, one agreement promised 70 jobs and reports 130, another promised zero and reports 59, and one projection reads exactly 2.5 jobs, printed as filed. Snapshots, not verdicts - and the file cuts both ways.

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 - July 16 and 17, 2026, with a 486.8 microgram hour and 96 percent of every 100-plus sensor-hour ever logged - beside an ordinary record where such hours are 0.45 percent of everything. Not for regulatory purposes, says the file itself, and this page keeps every caveat.

Chicago's height story, with receipts: the streets themselves were raised four to five feet on average in the 1850s, a building among the world's first skyscrapers went up - and came down - at LaSalle and Adams, the Willis Tower held the world title for nearly 25 years, and the city's own footprint file crowns a different king: two stories, 198,439 times. Eight vertical records, every one traceable.

Chicago's alternative-fuel file lists 398 stations, and the short answer is direct: 350 public electric stations marked Available, 283 of them posted 24 hours. The longer answer lives in the columns - 1,043 Level 2 ports against just 291 fast ports, 26 network labels, four ZIP codes holding 38 percent of everything, and a last-confirmed date on nearly every row. A decision-guide read of the whole file.