Sources and Climate Impact of Carbonaceous Aerosols (Fine Size-Fractionated Pms) During Extreme Smoke Haze Period in Upper Southeast Asia

• DOI: 10.2139/ssrn.4569251
• Publication Date: 2023-09-12T12:47:42Z
• Authors: Nuttipon Yabueng; Wittawat Insian; Somporn Chantara
• Keywords: Haze

Addressing the air pollution problem in upper Southeast Asia (SEA) becomes critical due to its serious impacts on health and environment. This study aims investigate sources of fine size-fractionated particulate matters (FSPMs), as well their potential impact climate warming. Ambient FSPMs with sizes between 0.43 – 2.1 μm (PM2.1-1.1, PM1.1-0.65 PM0.65-0.43) were collected at rural urban areas Chiang Mai (Thailand) during smoke haze period (March April 2019) SEA by using cascade impactors. Carbonaceous contents analyzed obtain organic carbons (OC1 - OC4) elemental (EC1 EC3). The average mass concentration was higher area (87.85 ± 34.42 µg/m3) than that (65.57 25.79 µg/m3). Total carbon also (30.69 13.75 (20.40 11.06 areas. For all PM both areas, OC3 EC1 (biomass burning markers) dominated. observation coincided high values char-EC/soot-EC ratio (31.03 25.10 (rural area) 28.29 19.42 (urban area)), which can be indicated biomass major source FPSMs this area. These findings corresponded level primary (POC) finest (0.65-0.43 um) opposed larger sizes. implied finer particles directly originated from local burning. In contrast, formation (PM2.1-1.1) predominantly influenced presence secondary (SOC), particularly area, existing precursors (VOCs, O3, NOx) emitted traffic. Referring effective ratio, especially, PMs are associated absorption solar radiation contributed atmospheric warming episodes region.