Inhalable particulate matter characterization in a medium-sized urban region in Brazil (São José dos Campos Town) - Part I: Morphology

Abstract

Recebido em 22/4/13; aceito em 2/7/13; publicado na web em 2/8/13In this study, the concentration and morphological characteristics of inhalable particulate material (PM10) were evaluated and associated with climatic conditions. The mean annual concentration was 11.0 µg m . Wind speed has a higher influence on PM10 dispersion, but direction was associated with particle source. During the wet period, wind speed is the main dispersion factor, while speed and direction both are important during the dry period. Based on the morphological characteristics, it is concluded that biogenic particles prevail during the rainy season and terrigenous particles during the dry period, depending on the wind direction and intensity.

Microscopic Investigation on Pm10 and Air-Cleaning Coatings Based on Nano-Tio2

“…They had the structural complexity of these particles, and their composition was dominated by carbon (C) and oxygen (O). The soot particles appeared as large clusters of small spheres united by chains and were found to be similar to those in studies of urban regions in Brazil [25]. Such particles are known to be produced by anthropogenic sources such as vehicular emissions and coal burning (Fig.…”

“…The internal mixing of metals and acidic constituents solubilizes metals and modifies metal inclusion shapes. The solubilization of metals in airborne particles can increase their toxicity in the particles [25].…”

“…In 2010, Russia set maximum permissible concentrations of PM 2.5 and PM 10 (35 and 60 μg/m 3 (24-hour mean concentrations), 25 and 40 μg/m 3 (annual mean concentrations), respectively) [3]. Since then, the number of automatic air monitoring posts has grown in Russian cities.…”