Rio keeps taking its data back from the people who were paid to run things. Fare records sat with a card company owned by the bus operators' own federation until the city tendered collection away from them in 2025; the BRT's control centre, GPS feed and ticketing passed to city hall when the operators' concession was revoked in 2022, which is why both the system's collapse and its record ridership in March 2026 can be counted at all. The pattern has a limit, and it is the same one twice: Rio's rain gauges and its heat index are read precisely and then handed to a person — sirens are sounded by civil defence staff, and even the top heat level says a suspension "may be indicated". The city's own favela sensors have read almost ten degrees hotter than the station those heat levels are computed from.
The atlas documents 13 projects in Rio de Janeiro, the earliest dating to 1990: 1 with a documented success, 1 scaled back, 11 still running without a verdict. Every entry carries an evidence grade — the strongest here is peer-reviewed (1 entry) — and links its sources.
Three entries that show what Rio de Janeiro is actually doing.
Computed from the 13 entries below — a profile, not a score.
The instruments came before the institutions. After landslides on the Tijuca massif in 1996, the city built Alerta Rio — today 33 telemetric stations reporting rainfall every five minutes, backed by two radars — and the planning institute IPP had been keeping a register of the city's favelas, SABREN, since 1990. Both still run. Neither was built as a smart-city programme; they were built because the city needed to know where the rain fell and who lived where.
Then came the decade of the mega-events, and with it the habit of contracting things out. The Operations Centre opened on 31 December 2010, the 1746 service channel in March 2011, and the Bilhete Único Carioca the same year. The first BRT corridor opened in June 2012, two years before the World Cup, and two more followed for the Olympics; the VLT tram opened in June 2016 in the port district that CEPAC development-rights certificates were supposed to pay for. Almost all of it was delivered by concessionaires, and the money assumptions underneath were untested: the entire CEPAC issue went in one 2011 auction to a single federal fund, and fewer than 10% were ever resold.
The bills arrived between 2017 and 2022, and they came due one contract at a time. The port concession suspended its services for non-payment in July 2017; the city took them over. A city-ordered intervention into the BRT found a 33% loss of operating fleet between March 2017 and March 2019, and 56 of 125 stations were shut by September 2020. In February 2022 Rio revoked the bus operators' concession outright and requisitioned the fleet, the stations and the ticketing system. Meanwhile waste collection went the other way: from 2019 a private hauler whose lorry arrives for inspection without a GPS tracker is failed on the spot.
Since 2024 the city has been writing thresholds — and stopping short of making them bind. A June 2024 decree gave Rio five heat levels computed from a forecast index every four hours, with the response steered by a committee and approved by the mayor. Facial recognition relaunched at the 2024 New Year, run by the state military police; the city's own camera network, now past 5,000 feeds, does descriptive rather than biometric search. The Jaé card became the only accepted fare medium on municipal buses, BRT and the tram on 2 August 2025.
On a time axis, by the year each one started — 1990 to 2024. Pick a dot to read what it was.
✔ Every published entry is checked against the public sources it cites before publication.
Editorial links between Rio de Janeiro's own entries — the city as a system, not a list.
Plans and announced trajectories — not yet documented results.
Three things are unresolved, and each is about what the city does with a number once it has it. First, having fought to get the boarding data, Rio still pays its bus subsidy per GPS-verified kilometre operated rather than per validated boarding — the count it took a concession revocation to obtain does not yet drive the money. Second, the warning systems are frozen at the shape of the maps they were built on: the siren network still matches the 2011 risk survey and has not been extended since, and a 2022 municipal audit report cited roughly 400 communities with neither sirens nor a geological risk study. Third, publication and permission have come apart. Rio releases every 1746 ticket back to 2011 — earlier than São Paulo — but under a no-derivatives licence, which forbids exactly the reworking that makes records useful; the portal ships CC BY 4.0 on most datasets with no decree requiring it, and its median dataset was last touched in December 2023. The accountability that bites still arrives sideways: it was local reporting, working from the open tickets, that showed the environmental patrol answering 9.8% of its queue after a support contract lapsed.
Where Rio de Janeiro appears in the atlas's own analysis.
Three cities the atlas reads next to Rio de Janeiro — the reason first, then the entries it rests on. Chosen by hand from the Rio de Janeiro threads below, not counted out of them.
The clearest pair in the atlas on what a reading is allowed to do by itself: a tsunami warning closes Osaka's tide gates with nobody in the loop, while Rio's sirens wait for an official to confirm the protocol before anyone hears them.
Brazil's two biggest cities, same services, different discipline: São Paulo dedicates its complaint records to the public domain but types its flood alert in by hand; Rio stamps its records and reads the alert off telemetric gauges.
The most closely matched pair in South America: the same bike-share operator on opposite cash flows, the same face matching against a fugitives list, and rain sensors that feed a control desk rather than trigger anything.
Every editorial link from Rio de Janeiro's entries into another city, strongest first. Each one is a statement about two projects, not about two cities — the three above are the ones the atlas is willing to make at city level.
1001 Smart Cities (2026). “Smart-city projects in Rio de Janeiro, Brazil.” The Smart City Atlas. https://1001smartcities.org/cities/rio-de-janeiro/ (last verified 2026-08-27). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.