Odour control systems do not give overall success unless the entire facility is properly enclosed and maintained, especially for the densely populated area like Hong Kong.
Increased concentrations of PM2·5 and traffic-related air pollution within metropolitan areas, in ranges commonly encountered worldwide, are associated with progression in coronary calcification, consistent with acceleration of atherosclerosis. This study supports the case for global efforts of pollution reduction in prevention of cardiovascular diseases.
The combined direct and indirect CO2 metabolic sources, estimated at 3.1 GtC/year, have increased 7 fold since pre-industrial times and are predicted to continue to rise over the 21st century.
The known deodorizing composition containing an iron (II) compound and a chelating agent is reactive with bad odor substances such as ammonia, amines, hydrogen sulfide, mercaptans.
The staffs working in the Namtaeryeong and the Gyeongbokgung station received relatively high radon exposure compared to the others. The reason is assumed that the stations are located on the granite, and particularly the Namtaeryeong station is deeper than the other stations.