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This study conducted four voyages of the surface of the waters of the Miaodao Archipelago in August 2018, October 2018, March 2019 and June 2019. In the seawater quality survey, 100 stations were set up to analyze the distribution of physicochemical parameters such as water temperature, pH, dissolved oxygen, chemical oxygen demand, dissolved inorganic nitrogen, PO4-P, total nitrogen, total phosphorus, petroleum hydrocarbons. The nutritional status and organic pollution status of the sea area were evaluated. The results showed that the mean value of water temperature was (16.8±5.69)℃, the average pH was 8.13±0.074, the average DO concentration was (8.62±1.46) mg/L, the average COD concentration was (0.85±0.29) mg/L, the average DIN concentration was (0.0706±0.0545) mg/L, the average PO4-P concentration was (0.0706±0.0545) mg/L, the average TN concentration was (0.255±0.148) mg/L, and the average TP concentration was (0.0133± 0.00639) mg/L, the average concentration of petroleum hydrocarbons was (0.0135±0.00755) mg/L. The physical and chemical parameters of the waters of the Miaodao Archipelago basically meet the Class II seawater quality standards. The water quality eutrophication index of the monitoring station in the sea area is basically < 1, and the nutritional status of the sea area is basically poor nutrition. The water quality of the sea area was evaluated by the organic pollution evaluation index method, and the water quality level of 96% of the monitoring stations in the four months was good.

Health-related quality of life (HRQOL) is currently an important issue in the medical industry. However, data on HRQOL in commercial airline pilots are lacking. This study aimed to investigate HRQOL and its related factors in a sample of commercial pilots. A purposive sample of 373 participants was recruited from a Chinese Commercial Airline. The median (IQR) score for physical health, psychological health and social relationship were 64.3 (75–53.6), 62.5 (70.8–54.2) and 75 (75–58.3), respectively. The mean (SD) score for Environment was 62.2 (16). After controlling for demographics, the multiple linear regression analyses showed that physical activity, fruit intake and vegetable intake were positively correlated with HRQOL score (p <.05), while time-zone flights, smoking, alcohol drinking and being dyslipidemic showed a negative correlation with HRQOL score (p <.05). Healthcare providers should consider time-zone flights, behavioral factors and dyslipidemia when planning related health promotion and disease prevention programs for commercial pilots in the future. [ABSTRACT FROM AUTHOR]

There is increasingly concern that PM 2.5 constituents play a significant role in PM 2.5 -related cardiovascular outcomes. However, little is known about the associations between specific constituents of PM 2.5 and risk for cardiovascular health. To evaluate the exposure to specific chemicals of PM 2.5 from various sources and their cardiac effects, a longitudinal investigation was conducted with four repeated measurements of elderly participants' HRV and PM 2.5 species in urban Beijing. Multiple chemicals in PM 2.5 (metals, ions and PAHs) were characterized for PM 2.5 source apportionment and personalized exposure assessment. Five sources were finally identified with specific chemicals as the indicators: oil combustion (1.1%, V & PAHs), secondary particle (11.3%, SO 4 2- & NO 3 - ), vehicle emission (1.2%, Pd), construction dust (28.7%, Mg & Ca), and coal combustion (57.7%, Se & As). As observed, each IQR increase in exposure to oil combustion (V), vehicle emission (Pd), and coal combustion (Se) significantly decreased rMSSD by 13.1% (95% CI: -25.3%, -1.0%), 27.4% (95% CI: -42.9%, -7.6%) and 24.7% (95% CI: -39.2%, -6.9%), respectively, while those of PM 2.5 mass with decreases of rMSSD by 11.1% (95% CI: -19.6%, -1.9%) at lag 0. Elevated exposures to specific sources/constituents of PM 2.5 disrupt cardiac autonomic function in elderly and have more adverse effects than PM 2.5 mass. In the stratified analysis, medication and gender modify the associations of specific chemicals from variable sources with HRV. The findings of this study provide evidence on the roles of influential constituents of ambient air PM 2.5 and their sources in terms of their adverse cardiovascular health effects., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020. Published by Elsevier Ltd.)