PM10 CONCENTRATIONS MEASURED IN OPEN PIT COAL MINES IN NORTHERN COLOMBIA: SEASONAL VARIATIONS, TRENDS AND SOURCE
Author(s)
ROBERTO R. ROJANO, HELI A. ARREGOCÉS, GLORIA RESTREPO
Abstract
PM10 particulate material is one of the criteria pollutants with the greatest monitoring in Colombia. Daily concentrations of PM10 were evaluated in an open pit coal mine (Cerrejón) located in northern Colombia, during 2012–2017. The annual mean concentration for PM10 varied from 22.89 to 41.54 µg/m3. The annual averages of all sampling sites exceed the WHO guidelines for PM10 (20 µg/m3). Daily PM10 concentrations exceeded the WHO PM10 guideline limit (50 µg/m3) for approximately 15.70% of the sampling days. PM10 concentrations at all sites presented a significant correlation (r ranged from 0.40 to 0.84). These strong relationships indicate the existence of common sources of PM10. A trend analysis was performed in all monitoring sites. PM10 concentrations showed positive trends for four sampling sites. The results of the conditional probability function (CPF) analysis indicate that open pit mining is the main source of emissions of PM10, contributing to concentrations higher than 45 µg/m3. The Cerrejón mine needs a plan to reduce particulate matter to comply with the new Colombian standards.
Keywords
PM10, conditional probability function, trends, open pit mining, coal mine, Cerrejón Colombia
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