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Parameters and references
​The concerns related with indoor air quality (IAQ) in buildings stem from the fact that, nowadays, people spend more and more time indoors (in offices, classrooms, laboratories, etc.) and are exposed to a varie​ty of pollutants. It is important to control and correct this reality in order to improve the quality of life of the people that use indoor spaces. 

Therefore, UMinho monitors the IAQ by measuring the following parameters:

Physical-chemical parameters

  Unit Reference conditions Margim of tolerance (MT)  [%] 2
Particular matter (fraction PM10) [µg/m3] 50 100
Particular matter (fraction PM2,5) [µg/m3] 25 100
Total of Volatile Organic Compounds (VOC) 1 1 [µg/m3]​​ 600 100
Carbon Monoxide (CO) 1 1 [mg/m3] 10
Formaldehyde (CH2O) [µg/m3] 100
Carbon Dioxide (CO2) [mg/m3] 2250 30

Table 3:  Physical-chemical parameters
1. According to the total of CO and VOC parameters, if the concentr​ations measured are superior to the limits of protection, the verification of compliance must be carried out by conducting testes over a longer period of time, in the case of CO, and by testing the composition of pollutants present in VOC, such as benzene, toluene, among others. 
2. The margins of tolerance are applied to existing and new buildings that do not have mechanical ventilation systems.

Microbiological pollutants

 ​​​ Matriz​ Unit Reference conditions
Bacteria Air [UFC/m3] Total concentration of bacteria inside plus the concentration outside, plus 350 CFU/m3
Legionella Water [UFC/L]​​​ Concentration inferior to 100 CFU/L, except in the case study of cooling towers in which the concentration should be inferior to 1000 CFU/L
Fungus Air [UFC/m3] Concentration of fungus inside is inferior to the one detected outside.​

(Decree n.º 353-A/2013, of 4 december)