Solution:
1. The national standard "Health Standards for Formaldehyde in Residential Air" states that the maximum permissible concentration of formaldehyde in residential air is 0.08 mg/m3 (0.08mg/m3)
2. Formaldehyde is a chemical with an irritating smell, and when formaldehyde in indoor air reaches 0.1 (mg/m3), people will feel the odour and discomfort.
3. The magnitude of formaldehyde concentration in indoor air is related to the following four factors.
①Indoor temperature.
② the relative indoor humidity.
③ The loading of indoor materials (i.e. the surface area of formaldehyde emitting materials per cubic metre of indoor space).
④ The amount of indoor air circulation.
Note:
1. Formaldehyde emission is exacerbated by high temperature, high humidity, negative pressure and high loading conditions. Normally, formaldehyde can be released for as long as 3 to 10 years.
2. Common removal methods.
①Ventilation.
②Physical adsorption.
③Traditional method.