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Monitoring air quality in the municipal wastewater treatment plants is an initial stage in preventing several problems related to air emissions. This study measured 103 volatile organic compounds (VOCs), total VOC (TVOC), and some prominent air pollutants (CO, CO 2 , NH 3 , H 2 S, PM 1 , PM 2.5 , PM 7 , PM 10 , TSP) in the municipal wastewater treatment plant X located in the north of Taiwan. Thirty-three VOCs were identified, which categorized as alkane, aromatic, alkene, ester, ether, haloalkane and ketone. Five dominant factors were determined from principal component analysis (PCA). The first factor involves indoor activities (such as particulate matter resuspension), and outdoor activities (such as vehicles exhausts), which explained 32.42% of total variance. Factor 2 was paint applications and domestic wastewater decomposition, with an explained variance of 17.23%. Factor 3 was solvent use, with an explained variance of 14.26%. Factor 4 was solvent use and road dust, with an explained variance of 8.54%. Factor 5 was a byproduct of the chlorination treatment process, with an explained variance of 6.92%. The five factors explained 79.37% of total variance. By applying absolute principal component scores (APCS), source apportionments were obtained having 35.21%, 26.04%, 16.13%, 7.03%, and 15.59% for factors 1, 2, 3, 4, and 5, respectively. Toluene had the highest ozone formation potential (OFP).

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Coco fiber press is a method of printing the fibers from coconut coir definition, with many stages of manual handling. Manual tasks done continuously for 8 hours, this can cause musculoskeletal disorders ( MSDs). Thus, the Nordic Body Map questionnaire was used to assess workers' severity against Musculoskeletal Disorders (MSDs). Based on the findings of the 12-person Nordic Body Map questionnaire, it indicates that as many as 8% of workers are at low musculoskeletal risk, 33% of workers are at moderate musculoskeletal risk, and as many as 59% of workers are at high musculoskeletal risk. Analysis of the Rapid Entire Body Assessment (REBA) method shows that the operation of inserting coconut fiber into the press has a very high value of 11 which needs immediate action. Analysis of the Recommended Weight Limit (RWL) and Composite Lifting Index (CLI) methods for multi-task work shows that the CLI value is classified as high risk because>3, it will cause worker physical stress. The REBA score on the task of inserting coco fiber into the press machine decreased to 3 after improvement with a low-risk level.

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