1. Commodities are the main sources of pollution: for example, clothing, fabrics and bedding all contain plasticizers, which contain the release of harmful components;

2. The release of formaldehyde, benzene series, TVOC and other harmful substances in store decoration materials;

3. All kinds of billboards in shops will release toxic gases;

4. Indoor personnel are also the main pollution sources;

3, harmful gas pollutants into the outdoor environment.