Ko, Hyun Sik Jeong, Sang Bin Phyo, Sooyeol Lee, Jiwon Jung, Jae Hee 2024-01-19T15:00:35Z 2024-01-19T15:00:35Z 2021-09-05 2021-05 1001-0742 https://pubs.kist.re.kr/handle/201004/117084 Indoor air quality (IAQ) directly affects the health of occupants. Household manufacturing equipment (HME) used for hobbies or educational purposes is a new and unexplored source of air pollution. In this study, we evaluated the characteristics of particulate and gaseous pollutants produced by a household laser processing equipment (HLPE). Various target materi-als were tested using a commercial HLPE under various operating conditions of laser power and sheath air flow rate. The mode diameters of the emitted particles gradually decreased as laser power increased, while the particle number concentration (PNC) and particle emission rate (PER) increased. In addition, as the sheath air flow rate quadrupled from 10 to 40 L/min, the mode diameter of the emitted particles decreased by nearly 25%, but the effect on the PNC was insignificant. When the laser induced the target materials at 53 mW, the mode diameters of particles were <150 nm, and PNCs were >2.0 x 10(4) particles/cm(3). Particularly, analyses of sampled aerosols indicated that harmful substances such as sulfur and barium were present in particles emitted from leather. The carcinogenic gaseous pollutants such as acrylonitrile, acetaldehyde, 1,3-butadiene, benzene, and C-8 aromatics (ethylbenzene) were emitted from all target materials. In an actual indoor environment, the PNC of inhalable ultrafine particles (UFPs) was >5 x 10(4) particles/cm(3) during 30 min of HLPE operation. Our results suggest that more meticulous control methods are needed, including the use of less harmful target materials along with filters or adsorbents that prevent emission of pollutants. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. English SCIENCE PRESS AIR-POLLUTION ULTRAFINE PARTICLES SURFACE NANOPARTICLES GENERATION PRINTERS EXPOSURE ABLATION FINE VOC Emission of particulate and gaseous pollutants from household laser processing machine Article 10.1016/j.jes.2020.10.018 1 JOURNAL OF ENVIRONMENTAL SCIENCES, v.103, pp.148 - 156 JOURNAL OF ENVIRONMENTAL SCIENCES 103 148 156 scie scopus 000630090400014 2-s2.0-85095415056 Environmental Sciences Environmental Sciences & Ecology Article AIR-POLLUTION ULTRAFINE PARTICLES SURFACE NANOPARTICLES GENERATION PRINTERS EXPOSURE ABLATION FINE VOC Indoor air quality (IAQ) Emission Laser processing Ultrafine particles (UFPs) Volatile organic compounds (VOCs)