Contrasting compositions of PM in Northern Thailand during La Niña (2017) and El Niño (2019) years.

There have been a very limited number of systematic studies on PM compositions and their source contribution in Southeast Asia. This study aims to explore the characteristics of PM composition collected in Chiang Mai (Thailand) during La Niña and El Niño years and to apportion their sources during smoke haze and non-haze periods. The average PM concentration of smoke haze episode in 2019 (El Niño) was much higher than in 2017 (La Niña).

Size-fractionated PM-bound PAHs in urban and rural atmospheres of northern Thailand for respiratory health risk assessment.

Size-fractionated particulate matters (SPMs) in a range of 9.0 to 0.43 μm, classified based on aerodynamic diameter (d) as fine PMs (0.

Fresh and aged PM and their ion composition in rural and urban atmospheres of Northern Thailand in relation to source identification.

This study aims to investigate ion composition of PM in various sites and seasons and to identify the main sources on spatial and temporal basis. PM compositions of two urban and two rural areas in Northern Thailand in 2019 were investigated to distinguish urban traffic and rural open burning sources. During the burning season, average PM concentrations in rural areas (104 ± 45 μg m) were slightly higher than those in urban areas (94 ± 39 μg m).

Emissions of pollutant gases, fine particulate matters and their significant tracers from biomass burning in an open-system combustion chamber.

An open-system combustion chamber was designed and constructed for simulation of burning of various biomass types to estimate emission factors of pollutant gases, fine particulate matters and their composition to find out significant tracers. Rice straw (RS), maize residues (MR) and forest leaf litters (FLL) from mixed deciduous forest (MDF) and dry dipterocarp forest (DDF) were collected from various places in Northern Thailand based on land-use types. Approximately 1 kg of air-dried biomass sample was burned in the chamber, PM were collected.

Polycyclic aromatic hydrocarbon removal from petroleum sludge cake using thermal treatment with additives.

Petroleum sludge is a hazardous waste that contains various organic compounds including polycyclic aromatic hydrocarbons (PAHs) which have carcinogenic-mutagenic and toxic characteristics. This study focuses on the thermal treatment (indirect heating) of petroleum sludge cake for PAH degradation at 250, 450, and 650 degrees C using Ca(OH)2 + NaHCO3 as an additive. The treatment was conducted in a rotary drum electric heater.