The supply air from the airliner ventilation system is a mixture of outside air and recirculated air that passes through a high efficiency particulate air (HEPA) filter. The effectiveness of two commercial-available airliner cabin air filters were investigated under the laboratory-based measurement due to the practical restriction of airliner cabin filter test during usage. The filtration effic...

OBJECTIVE Hepatitis A infection causes severe disease among adolescents and adults. The Advisory Committee on Immunization Practices instituted incremental recommendations for hepatitis A vaccination (HepA) at 2 years of age based on risk (1996), in selected states (1999), and universally at 1 year of age, with vaccination through 18 years of age based on risk or desire for protection (2006). W...

The ongoing COVID-19 pandemic made us re-realize the importance of environmental disinfection in indoor areas. Several studies have documented that air purification system combining UV light and high-efficiency particulate (HEPA) filtration can successfully remove virus from air. However, cannot penetrate deep into HEPA, which causes pathogens inside be killed. In this study, we analyzed potent...

The widespread, intentional and increasingly frequent chemical emplacement in the troposphere has gone unidentified and unremarked in the scientific literature for years. The author presents evidence that toxic coal combustion fly ash is the most likely aerosolized particulate sprayed by tanker-jets for geoengineering, weather-modification and climate-modification purposes and describes some of...

Exposure to traffic-generated ultrafine particles (UFP; particles <100 nm) is likely a risk factor for cardiovascular disease. We conducted a trial of high-efficiency particulate arrestance (HEPA) filtration in public housing near a highway. Twenty residents in 19 apartments living <200 m from the highway participated in a randomized, double-blind crossover trial. A HEPA filter unit and a parti...

Abstract Indoor air quality is crucial to observe because most people spend 90% of their time in the room. influenced by various parameters, especially PM 2,5 , from a mixture outside and inside room itself. If occupants are exposed this parameter continuously, it will affect occupant’s health significantly. Hence, necessary control indoor if exceeds specified standards. One technology reduce a...