Rio de Janeiro, Brazil's second-largest city and a megacity, functions as both a municipality and the capital of the State of Rio de Janeiro. Divided into 33 sub-city districts, the City Hall manages local governance. The Rio de Janeiro Metropolitan Region, a legally-defined planning concept, encompasses 20 other adjacent municipalities. While there is no formal governance structure, metropolitan coordination is achieved through collaborative initiatives like integrated public transportation and the IntegraRio program, managed by the city’s Special Secretariat for the Metropolitan Region.
Rio de Janeiro has public transport accessibility is high at 90%, well above the global average of 68%. Particle pollution levels dropped by 30% since 2000, and NO₂ levels decreased by 11% to reflecting the city's ongoing efforts to improve both public transport options and air quality.
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