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No Brasil, o transporte rodoviario e o segundo maior emissor de gases de efeito estufa provenientes de acoes antropicas, representando 7,8% do total, ficando atras apenas do subsetor de mudancas no uso da terra e das florestas, com 76,3 % do total. O transporte publico em Belo Horizonte utiliza o diesel como combustivel, que quando queimado emite poluentes como o monoxido de carbono, oxidos de nitrogenio e material particulado. No bairro Buritis circulam diariamente 12 linhas de onibus e para estimar a emissao mensal dos poluentes citados empregou-se o metodo "Bottom-up", utilizando-se dados como a idade media da frota para determinacao dos fatores de emissao de cada poluente e a quilometragem mensal total percorrida nos limites do bairro. Os valores encontrados foram 148,54 kg/mes para o CO, 711,84 kg/mes para o NO x e 12,84 kg/mes para o MP. Estes resultados representam menos que 1% das emissoes em Belo Horizonte e o esperado, considerando-se a area do bairro em relacao a cidade, seria de pelo menos 1,15%. As emissoes menores que as esperadas ocorreram provavelmente por apenas 0,63% do total da quilometragem mensal percorrida pelos onibus em Belo Horizonte corresponder ao bairro Buritis. Neste contexto, sugeriu-se um estudo futuro de qualidade do ar local atraves de modelagem matematica para determinar a dispersao mensal destes poluentes emitidos no bairro e avaliar como o transporte publico contribui com a mesma. ABSTRACT In Brazil, road transport is the second largest greenhouse gas emitter from human activities, representing 7.8% of the total, behind only the changes subsector in land use and forestry, with 76.3% of the total. Public transport at Belo Horizonte uses diesel as fuel, it emits pollutants when burned as carbon monoxide, nitrogen oxides and particulate material. In Buritis neighborhood circulate daily 12 bus lines and to estimate the monthly emissions of the said pollutants we used the method "Bottom-up", using data such as the average age of the fleet to determine the emissions of each pollutant factors and mileage total monthly traveled on the outskirts of the neighborhood. These values were 148.54 kg/month of CO, 711.84 kg/month of NOx and 12.84 kg/month of MP. These results represent less than 1% of emissions in Belo Horizonte and expected, considering the area of the neighborhood over the city, would be at least 1.15%. Lower emissions than expected probably occurred for only 0.63% of the total monthly mileage traveled by bus in Belo Horizonte match Buritis neighborhood. In this context, it was suggested a future study of local air quality through mathematical modeling to determine the monthly dispersion of these pollutants in the neighborhood and assess how public transport contributes to it.

ESTIMATIVA DA EMISSÃO DE POLUENTES PELO TRANSPORTE PÚBLICO NO BAIRRO BURITIS EM BELO HORIZONTE/MG