RESUMO O ozônio presente na baixa atmosfera se caracteriza como um poluente do ar por causar danos à saúde humana e ao meio ambiente, impactando principalmente o sistema respiratório e a vegetação natural e agrícola. Sua concentração é mais elevada no meio urbano devido aos seus precursores (NOx, CO e COVs) serem emitidos, majoritariamente, por indústrias e veículos automotores. O objetivo deste trabalho experimental foi determinar as concentrações de ozônio troposférico em cinco pontos de Uberlândia, o segundo município mais populoso do estado de Minas Gerais, pelo método dos amostradores passivos, proposto por Christian Friedrich Schönbein, o químico que identificou e nomeou o ozônio. Após oito horas de exposição, as concentrações de três dos pontos amostrados superaram o padrão estabelecido pela legislação. Os resultados obtidos permitem estimar a concentração de ozônio média em Uberlândia e sua distribuição espacial. PALAVRAS-CHAVE: meio urbano, poluição do ar, química atmosférica. CONCENTRATION OF TROPOSPHERIC OZONE IN UBERLÂNDIA (MG) BY SCHÖNBEIN'S METHOD ABSTRACT The ozone present in the lower atmosphere is characterized as an air pollutant by causing damage to human health and the environment, impacting mainly the respiratory system and natural and agricultural vegetation. Its concentration is higher in the urban environment because of its precursors (NOx, CO and VOCs) are emitted, predominantly, by industries and automotive vehicles. The objective of this experimental work was to determine tropospheric ozone concentrations in five points of Uberlândia, the second most populous city in the state of Minas Gerais, by the method of passive samplers, proposed by Christian Friedrich Schönbein, the chemist who identified and named the ozone. After eight hours of exposure, the concentrations of three of the points sampled exceeded the standard established by the legislation. The results obtained allow us to estimate the average ozone concentration in Uberlândia and its spatial distribution.
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