por Bioconservacion Febrero 1st, 2017 0 comentarios

WHAT IS INDOOR AIR QUALITY?

Indoor Air Quality (IAQ) refers to the degree of air purity inside buildings that constitute the usual environment in which people carry out activities (offices, homes, schools, shopping and leisure centres, etc.)

Because of increasing urbanisation and our contemporary lifestyle, most people spend a large proportion of their time in these closed environments.

The high level of atmospheric pollution in urban environments and its short- and long-term impact on human health are well known.

However, inside buildings, levels of contamination can be 5 to 10 times higher than outdoors. This is due to the numerous sources of pollution to be found in office blocks and homes. For example: furniture, cleaning materials, etc.

The main atmospheric pollutants, which have a very negative impact on health, are particles produced by the use of solid fuels and heavy hydrocarbons.

Every year millions of people all over the world die because of pollution caused by such particles, especially in countries where the use of solid fuels is predominant.

Another significant group of pollutants which are causing increasing concern are gases and vapours: Formaldehyde, NOx, SO2, Ozone O3, Benzene, Polycyclic Aromatic Hydrocarbons (PAH).

Different states and organisations have established legislation and recommendations on permissible levels of pollutants in indoor air.

 

The following table summarises the permissible levels of gaseous pollutants established by the European Union for indoor air (values for particles are not included):

Pollutant gas

Maximum concentration

Units

Exposure allowed

SO2(Sulphur dioxide)

350

µg/Nm3

1 hour

 

125

µg/Nm3

24 hours

NO2 (Nitrogen dioxide)

200

µg/Nm3

1 hour

 

40

µg/Nm3

1 year

CO (Carbon monoxide)

10

mg/Nm3

8 hours/day

Benzene 

5

µg/Nm3

1 year

O3(Ozone)

120

µg/Nm3

8 hours/day

PAH (Polycyclic Aromatic Hydrocarbons)

1

ng/Nm3

1 year

 

To meet regulatory requirements, gas filtration systems are increasingly being incorporated in heating, ventilation and air-conditioning (HVAC) systems, for example in offices.

Bioconservacion has a wide range of filtration products that allow the main gases with an impact on human health to be eliminated. All these products have been developed in Bioconservacion's R&D laboratory.

 

The following table gives a very brief summary of solutions for the elimination of each type of gas and the product that can be used in each case. 

 

Pollutant gas

Bi On® solution

Method of elimination

SO2(Sulphur dioxide)

Bi On Isorb

Chemisorption

NO2 (Nitrogen dioxide)

Bi On Isorb

Chemisorption

Benzene 

Bi On AC

Physical adsorption

O3(Ozone)

Bi On AC

Adsorption/Chemisorption

PAH (Polycyclic Aromatic Hydrocarbons)

Bi On AC

Physical adsorption