Influence of Meteorology on Fine Particles Concentration in Vitória Metropolitan Region During Wintertime

Author:

Andreão Willian Lemker1ORCID,Trindade Bruna Tuão2,Nascimento Antônio Paula2,Reis Júnior Neyval Costa2ORCID,Andrade Maria de Fátima3ORCID,Albuquerque Taciana Toledo de Almeida4ORCID

Affiliation:

1. Universidade Federal de Minas Gerais, Brazil

2. Universidade Federal do Espírito Santo, Brazil

3. Universidade de São Paulo, Brazil

4. Universidade Federal de Minas Gerais, Brazil; Universidade Federal do Espírito Santo, Brazil

Abstract

Abstract Fine particles (PM2.5) are harmful to human health especially during periods of limited dispersion when the concentrations build up. This is a common occurrence in Southern Brazil in the dry season when high-pressure stationary systems inhibit vertical dispersion and reduce wind speed. The objective of this study was to evaluate the PM2.5 concentrations in the Region of Greater Vitória during the winter of 2013, and to assess the influence of the large-scale meteorological circulation on its concentration. An experimental campaign was carried out to determine the mass of PM2.5 at six urban sites and particle number concentration. The average PM2.5 concentrations varied from 9.70 μg m-3 to 14.36 μg m-3 with the average daily maximum reaching 29.35 μg m-3, exceeding the World Health Organization guideline (24-h average: 25 μg m-3). The particle size distribution showed a larger number of particles from 18 to 21 h (local time), indicating that the main vehicular emissions are the main sources. During the winter, rainfall associated with cold fronts were responsible for a decrease in the particulate concentrations. In contrast, the occurrence of high-pressure systems led to an increase in particle concentrations, due to stagnant conditions.

Publisher

FapUNIFESP (SciELO)

Subject

Atmospheric Science

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