The UV-light disinfection system must operate in UNOCCUPIED rooms. No touch UV technology is dependent on the distance between the lamp and the surface being disinfected. The inverse square law applies.
In conclusion, the rapid COVID-19 infection spread observed in selected regions of Northern Italy is supposed be related to PM10 pollution due to airborne particles able to serve as carrier of pathogens.
Children in schools constitute a particularly vulnerable population group to indoor air quality, because of their physiological and behavioural characteristics. They have higher ventilation rates and higher levels of physical activity with the result that they receive much higher doses of air pollutants than adults.
Indoor CO2 concentrations exceeded the ASHRAE standard due to overcrowded classrooms and inadequate ventilation. Implementation of more breaks and recesses between classes might alleviate the high level of CO2. The occupancy of classrooms in Hong Kong often exceeded the maximum occupancy of the ASHRAE 62-1989 standard. Decreasing the number of students in each classroom can also lower the CO2 level. Increase the rate of ventilation could remove the accumulated CO2; for example, the use of ceiling fans, exhaust fans could increase the exchange of indoor air with the outdoor.
Our observation of a reduced functional connectivity during CO2 breathing is consistent with previous reports that light sedation or anesthesia (Deshpande et al, 2010) decreases connectivity in DMN regions, and is also in line with the suggestions that CO2 has a mild sedative effect.
Our observation of a reduced functional connectivity during CO2 breathing is consistent with previous reports that light sedation (Greicius et al, 2008) or anesthesia (Deshpande et al, 2010) decreases connectivity in DMN regions, and is also in line with the suggestions that CO2 has a mild sedative effect (Fukuda et al, 2006).
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