ИСТИНА

The impact of fires of traditional agriculture activity during the dry season on regional particulate matter (PM) level and chemical composition of atmospheric pollutants is a major environmental concern in Vietnam. In order to evaluate the optical, physical, and chemical characteristics of local and regional biomass burning in the rural area, a number of measurement campaigns were carried out on the fields during post-harvesting activities as well as at the site in the Bavi National Park, Bavi province. On-field emissions of piled-up rice-straw burning in both smoldering and flaming phases were analyzed in near-source measurements. To emphases the specific atmospheric pollutants of different source emissions the additional campaigns were performed in the urban area. Daily PM10 samples were collected during 2 weeks in May-June 2015, the period of numerous open fires detected around the Bavi site. High time-resolved monitoring of black carbon (BC) concentrations was performed during the sampling, and these concentrations were seen to be dependent on factors such as weather conditions, combustion temperature (smoldering versus flaming conditions), and fuel combusted. Chemical analysis of local and regional PM10 samples identified carbonaceous fractions (OC, EC), ionic compounds, elements, and organic and inorganic components. Individual particle analyses provided the major groups comprising the smoke microstructure. Analysis of the collected data showed the environmentally-dangerous organic and inorganic pollutants for interpreting the impact of the sources of adverse PM in urban and rural areas of high population