Resumen

GONZALEZ-DUQUE, Carlos Mario; CORTES-ARAUJO, Johana  y  ARISTIZABAL-ZULUAGA, Beatriz Helena. Influence of meteorology and source variation on airborne Pm₁₀ levels in a high relief tropical Andean city. Rev.fac.ing.univ. Antioquia [online]. 2015, n.74, pp.200-212. ISSN 0120-6230.

Atmospheric particulate matter (PM₁₀) was evaluated with meteorology, mixing height and source variation over a two-year period (from January 2010 to December 2012) in the densely populated tropical Andean city of Manizales. The highest levels of PM₁₀ were observed in areas with the highest vehicular density with values in a range of 18 - 69 µg m^-3. PM₁₀ concentrations were influenced by meteorological parameters, positively associated with temperature (r = 0.40), and negatively associated with relative humidity (r = -0.47) and precipitation (r = -0.38). The effects of scavenging by precipitation were observed by analyzing PM₁₀ concentrations for dry periods versus wet periods. The high sulfate PM₁₀ ionic contents observed throughout the city were consistent with the influence of public transport and automobiles, which use diesel and gasoline as principal fuels, and are recognized as the main source of particulate matter emissions. Increasing midday mixing height over downtown of the city (from 900 m to 1600 m) effectively diluted peak hour emission from vehicular traffic, as observed over a 24 hour sampling period, with 30-second intervals. These preliminary data suggest factors important to modeling PM₁₀ in high rainfall and densely populated tropical mountain ecosystems.

Palabras clave : PM₁₀; meteorological variables; scavenging; mid-sized Andean cities.

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