The Effect Of Green Spaces On Urban Climate And Pollution

The climate of a conurbation is of great importance, in particular for public health and to provide good environment. Town planning should take into account how it can influence microclimate, especially in view of pollutant emissions by internal combustion engines. The objective of this study was to know the role and behaviour of green spaces in major cities on climate and air pollution. This article provides case studies of the effect of urban parklands on temperature, humidity and pollution, based on a series of formal measurements. Analysis of climatic data has found that gardens and parklands are responsible for significant precipitation. In this study, the present examples, which represent the most frequent cases found during the campaign measures, conform to this pattern. The influence of different types of gardens on temperature, humidity, wind, precipitation and the distribution of air pollution are presented. The results clearly showed the important role of parklands in urban areas. The parklands decreasing temperatures promote the reduction of urban heat island. Such green spaces, gardens and even squares are the least polluted places in a town. Breezes generated by the parklands repel and disperse pollutants, generally issue from traffic cars. Green spaces and gardens contribute significantly to improving the microclimate and reducing the rate of pollution in the city. Therefore, the parklands are the lungs of the city. The parkland should be the most important developments in the city of tomorrow

Development of a passive doas system to retrieve atmospheric pollution columns in the 200 to 355 nm region

<p>Abstract</p> <p>In recent years several techniques have been developed to measure and monitor the pollution of the air. Among these techniques, remote sensing using optical methods stands out due to several advantages for air quality control applications. A Passive Differential Optical Absorption Spectroscopy system that uses the ultraviolet region from 200 to 355 nm of the solar radiation is presented. The developed system is portable; therefore it is practical for real time and in situ measurements. The enhanced wavelength range of the system is intended to detect the ultraviolet light penetration in the Mexican Valley considering the solar zenith angle and the altitude. The system was applied to retrieve atmospheric SO₂ columns emitted either by anthropogenic (power plant) or natural sources (volcano), reaching a detection limit of about 1 ppm. The measurement of the penetrating solar radiation on the earth surface at the UVC range is presented and the possibility to measure pollution traces of some contaminants as O₃, NO₂ and aromatic compounds in real time and in situ in the ultraviolet region is discussed.</p

Clima urbano e saúde: uma revisão sistematizada da literatura recente

Foi feita revisão sistematizada de 67 artigos sobre o tema Clima Urbano e Saúde a partir de busca nas plataformas Web of Science e Pub Med. Os artigos foram organizados por data de publicação, país de realização do estudo, por temas: metodologias; evidências de riscos à saúde por estresse térmico e por doenças infecciosas relacionadas ao clima; mitigação dos extremos do clima urbano por vegetação e outras formas; cobenefícios e articulações políticas