Indoor air quality<br>The average indoor PM 10 concentration measured in normal winter and normal summer is lower than the WHO annual PM10 indoor air guide, which is 20 μ g / M 3, to maintain acceptable indoor PM quality and health.<br>The average indoor PM2.5 concentration in two seasons was lower than that of who annual pm2.510 μ g / M 3.<br>During the normal operation of HVAC, indoor PM10, PM2.5 and PM1 are much lower than outdoor, which indicates that the system helps to remove outdoor particles.<br>The concentration of PM2.5 measured at indoor air outlet is 70% lower than that measured outdoors.<br>This means that the filtration system in this system may also help clean the air pollution.<br>The average indoor concentration in winter is 20 ppb to 30 ppb<br>30ppb to 40ppb in summer<br>It exceeds the WHO indoor air quality standard of 40 μ g / M 3 in the sampling period.<br>
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