In this work, the air quality indexes (AQIs) determined in Rio de Janeiro from July to September 2016, before and during the Summer Olympic and Paralympic Games, in the monitoring stations operated by the Municipal Secretariat of the Environment, were compiled and analyzed. Only four automatic monitoring stations determined all the Brazilian criteria pollutants (smog, total particulate matter, PM 10 (particulate matter < 10 mm), NO 2 , ozone and SO 2). NO 2 and PM 10 levels were generally lower during the Olympic period because of restrictions on vehicular flux. However, ozone concentrations remained high, due to unfavorable meteorological conditions. The worst conditions were observed in Bangu and Irajá Districts, where ozone concentrations frequently exceeded 160 mg m-3. According to the World Health Organization (WHO), as ozone concentrations increase above this value, health effects became increasingly numerous and more severe. Brazilian air quality allowable standards are clearly higher than WHO guidelines, which, in addition to the combined results of the adopted air quality indexes and the use of a restricted number of criteria pollutants to report the air quality, led to AQIs in the intervals good and moderate, despite concentrations frequently being high in terms of WHO guidelines.
The air quality during the Summer 2016 Olympic Games in two Olympic zones, Maracanã (Tijuca) and Deodoro, was studied. Volatile organic compounds (VOCs) were collected and analyzed following method TO-15 (United States Environmental Protection Agency), during and in the days after the Games. The total VOC (C 4 -C 12 ) concentrations were 39.2-160.9 and 36.6-191.4 µg m -3 for Tijuca and Deodoro, respectively. These concentrations were lower than values previously obtained in Tijuca and other areas of the city. VOC speciation and benzene/ toluene ratios were also different as a consequence of the restrictions imposed on vehicular transit during the Olympic Games. Concentrations were discussed considering the reactivity and ozone forming potential of individual compounds. Criteria pollutants, determined by the Tijuca Automatic Monitoring Station, were also analyzed. The preventive policies were successful in decreasing the concentrations of CO and PM 10 , leading to a decrease in mean ozone levels. However, air quality indexes were not dramatically reduced, because of the increase in NO x emissions and isolated events of higher ozone levels.
Resumo Neste estudo, foram analisados os possíveis efeitos das obras de mobilidade urbana, realizadas no bairro Centro da cidade do Rio de Janeiro, sobre a qualidade do ar. Foram tratados estatisticamente os dados de concentração obtidos na Estação de Monitoramento do Largo da Carioca para os poluentes PM10, CO, O3 e SO2, assim como os parâmetros meteorológicos, para os meses de julho e agosto de 2015 e 2016, respectivamente, ano que precedeu e ano em que foram realizados os Jogos Olímpicos Rio 2016. Os resultados obtidos mostram que, embora as concentrações dos poluentes monitorados não tenham, em geral, ultrapassado os padrões nacionais de qualidade do ar, os níveis de PM10 e de ozônio são preocupantes, especialmente considerando as orientações da Organização Mundial da Saúde. Os níveis maiores de ozônio em agosto de 2016 podem ser consequência do aumento da radiação solar ou ainda dos processos químicos envolvidos na sua formação e das concentrações de seus precursores, os compostos orgânicos voláteis e os óxidos de nitrogênio (NOx). Para entender e explicar tais resultados, é indispensável dispor de dados de monitoramento contínuo de NOx e hidrocarbonetos não metânicos totais. No entanto, existe uma grave deficiência da Estação do Largo da Carioca quanto à aquisição desses dados. Apesar do esforço do corpo técnico da Secretaria Municipal de Meio Ambiente da cidade do Rio de Janeiro, o investimento do município no controle da qualidade do ar é ainda insuficiente, especialmente considerando que o NO 2 é um composto legislado, colocando em risco a saúde e o bem-estar da população.
Atmospheric processes in an urban scenario are very complex and depend on meteorological parameters, emission, transport and deposition processes and the chemical mechanism. Simple air quality models can be used to understand the main aspects of ozone formation and provide information to adopt pollution control strategies. In this work the detailed simulation of ozone concentrations using the air quality model OZIPR (Ozone Isopleth Package for Research) coupled with the SAPRC (Statewide Air Pollution Research Center) chemical model is presented. First, the methods to determine volatile organic compounds (VOCs) are described as well as the statistical treatment of experimental data: Meteorological parameters (temperature, humidity, pressure, wind speed and direction), concentrations of nitrogen oxides (NO x = NO 2 + NO), carbon monoxide (CO) and ozone (O 3), which are needed to characterize the problem. Then, the construction and adjust of the model (base case) is detailed using, as an example, data for a typical urban area in the city of Rio de Janeiro. Finally, the limitations and the potential of the model are discussed. Clearly the quality of experimental data, mainly NO x and COVs concentrations and the COVs speciation, are a key information to obtain a correct estimation of O 3 levels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.