Southeast Asia is a major source region of biomass burning emissions. Moreover, economy is booming in East Asia, including Southeast Asia, resulting in increasing industrial activities and consumption of fossil fuels. The aforementioned activities cause the increases in regional air pollutant emissions and thus serious trans-boundary environmental pollution problems and changes of regional radiation balance and climate. Taiwan is located in East Asia, a region with significant monsoon activities, downwind of the transport paths of the East Asian anthropogenic air pollutant emissions and the Southeast Asian biomass burning emissions. Therefore, the location of Taiwan is very suitable for the studies of impacts of long-range transported biomass burning and anthropogenic emissions on regional air quality and radiation budget. In 2010, Taiwan EPA participated the Dongsha Experiment, which is an international experiment focusing on regional background air quality monitoring during the Southeast Asia biomass burning season. Taiwan EPA keeps supporting the participation of international monitoring projects regarding regional air quality. The main task of this year was to participate the 7-SEAS 2013 spring international experiment. In March and April, Taiwan collaborated with US NASA, Vietnam and Thailand to conduct concurrent intensive measurements at the Mt. Lulin, Heng Chun and Dongsha sites in Taiwan, Son La site in Vietnam, and Doi Ang Khang site in Thailand. Measurements included atmospheric chemistry, atmospheric physics, atmospheric radiation, trace gases, aerosol physics, aerosol chemistry, aerosol optics, and air toxics. Results of backward trajectory analysis for the experiment period indicate that Doi Ang Khang was mainly influenced by emissions from Indochina Peninsula. Son La was influenced by emissions from Indochina Peninsula and southern China. Mt. Lulin was under the influence of the westerlies. Both Heng Chun and Dongsha were influenced by the northeast monsoon. Results of aerosol measurements indicate that aerosol mass concentrations were much higher at Doi Ang Khang and Son La because these sites were located in the springtime biomass burning source region. Mass concentrations of aerosol were much lower at the three Taiwan sites as compared to the source region sites. The 7th 7-SEAS Data and Science Workshop and Technical Training were held in November 11-14 at National Central University in Taiwan. A total of 110 participants, including representatives from the USA, Thailand, Vietnam, Singapore, Indonesia and Malaysia, attended the workshop.