Indoor Air Quality <br>Figure 7 summarizes the use of box plots during and positions selected by the building air quality measurement situations hour. Normal average indoor winter and summer normal concentrations of PM 10 measurements of indoor air is lower than the WHO guidelines of the annual PM 10, is 20 micrograms / m 3, maintaining an acceptable quality of indoor PM health. <br>The average concentration of less than two seasons indoor PM2.5 PM2.5 annual WHO guidelines of 10 micrograms / m 3. <br>During normal operation of HVAC, indoor PM 10, PM 2.5 and PM 1 is much lower than outdoor, indicating that the system facilitates the removal of outdoor particles. <br>70% lower than the outdoor concentration of PM 2.5 measured concentration in the room air outlet measured. <br>This means that this system of filtration systems may also help clean ambient air pollution. <br>Winter indoor average concentration of 30 ppb to 20ppb <br>summer 30ppb to 40ppb <br>over indoor air quality standards of WHO in the sampling period of 40 micrograms / m3
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