Intake of PM2.5 Indoor 4 Times of Outdoor

New research into indoor air quality, launched by Tsinghua University, has revealed that on average the intake of PM2.5 - airborne particulate matter - indoors can be up to 3 times greater than that of outdoors a day in hazy weather.

The researchers collected indoor data with 407 volunteers between November 2014 and January 2015.

Their report shows that during the collection period, 20 hours of indoor exposure to PM2.5 accounted for 82% of the total amount of exposure in 24 hours in Beijing, suggesting the intake of PM2.5 indoors is3 times greater than that of outdoors.

The report also suggests that the distance from the road, height of residence, and air purifier use all had an effect on the concentration of PM2.5.

The experts suggest opening windows for a short time for ventilation, and then closing them for longer periods, to keep the PM2.5 to a minimum during the hazy days.