Evaluating the Efficacy of the MedicAir Air Purifier in Reducing Ambient Air Pollution in Classrooms
To keep pupils safe during Covid-19, schools were asked to provide ventilation but opening windows was not always a safe option
One strategy proposed by governmental bodies to reduce the risk of transmission of COVID-19
has been to employ natural ventilation in indoor spaces, which materially translates to opening
windows in public spaces such as schools. However, given that indoor air pollution in schools is
often linked to pollution from nearby roads, this may only exacerbate the issue of indoor air
pollution in urban schools.
Classroom air tests prove MedicAir air purifiers provide cleaner, safer air for pupils
Two classrooms were used in our experiment, of similar size, with the same number of occupants.
Windows were open throughout the experimental period, to reflect guidance on increased
ventilation, and a rural school was chosen to mitigate the confounding effects of road pollution
which would affect readings in urban schools.
We then placed two medical grade data loggers in the classrooms for 2 days in order to establish
a baseline level of PM2.5 and PM1 in both rooms. After the five days had passed, we then moved
identical MedicAir units (air purification units fitted with carbon and HEPA 13 filters, as well as a
UVC bulb) into both classrooms. However, only one of the two units contained a HEPA filter and
the other functioned as a control unit.
The units were then left on REAKT mode, which increased or reduced the throughput of the units
depending on ambient particulate matter levels, for two weeks. After this period, the filter was
removed from the first unit and placed in the second unit, and the experiment was repeated for a
further 2 week period.
Use of the MedicAir air purifier was able on average to reduce the airborne PM2.5 concentration
by over 50% in both rooms, and reduced the average PM2.5 level to significantly under the WHO
"We have shown that the use of the MedicAir air purification unit is an effective solution for the rapid clearing of particulates from the air."
The effects of PM2.5 and PM1 on human, and particularly, children’s health have been under increased scrutiny in light of the novel coronavirus pandemic. Several studies have suggested that air purification was able to effectively reduce the quantity of particulate contamination in air (14,15). This is rendered increasingly important given the correlation between indoor air quality and increased viral perpetuation and transmission in the air. The results of this experiment highlight the concerning levels of PM1 and PM2.5 in classrooms in the UK, even in rural surroundings when naturally ventilated per current guidelines using open windows. We have also shown that the use of the MedicAir air purification unit is an effective solution for the rapid clearing of particulates from the air, and is also effective at clearing particulates in the size range of bacteria and viruses rapidly in order to prevent transmission."
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