Universidade Veiga de Almeida, Campus Maracanã, Tijuca, Rio de Janeiro, RJ, Brazil.
Instituto de Química, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Bloco A, Sala 402A, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, Brazil.
Bull Environ Contam Toxicol. 2020 Apr;104(4):438-443. doi: 10.1007/s00128-020-02802-3. Epub 2020 Feb 15.
In the city of Rio de Janeiro (Brazil), the districts located in the northern area are considered the most critical regarding ozone levels year-round. In this study, the potential factors that contribute to high levels of ozone in the district of Irajá were investigated. The obtained results clearly showed that, in spite of the high correlation of ozone concentrations with wind speed and temperature, ozone episodes depend on the ratios of volatile organic compounds (VOCs) to nitrogen oxides (NO) rather than on the individual VOC and NO levels, as expected for the VOC-controlled condition typical of the urban area of Rio de Janeiro. Moreover, high VOCs/NO ratios are highly dependent on the transport of air masses. When pollutants are transported from urban areas with heavy vehicular flux and high NO concentrations, ozone levels are reduced. When air masses are transported from the industrial petrochemical area, NO levels are relatively low, and ozone episodes are frequent.
在巴西里约热内卢市，位于北部地区的区被认为是全年臭氧水平最关键的地区。在这项研究中，调查了导致伊拉雅区臭氧水平高的潜在因素。研究结果清楚地表明，尽管臭氧浓度与风速和温度高度相关，但臭氧爆发取决于挥发性有机化合物（VOCs）与氮氧化物（NO）的比值，而不是预期的那样，与典型的里约热内卢市区的 VOC 控制条件下的单个 VOC 和 NO 水平相关。此外，高 VOCs/NO 比值高度依赖于空气团的输送。当污染物从交通繁忙、NO 浓度高的城市地区输送时，臭氧水平会降低。当空气团从工业石化区输送时，NO 水平相对较低，臭氧爆发频繁。
