(1) Meteorological factors. Building ventilation can obtain outdoor air, so outdoor weather changes have a great impact on indoor ventilation, temperature, humidity and exposure time in the indoor environment. There are two main meteorological factors that affect the diffusion of air pollution. The main meteorological dynamic factors are wind and turbulence, which play a decisive role in the diffusion and dilution of pollutants. Meteorological thermal factors mainly refer to the temperature layer and air stability.
(2) Indoor and outdoor air exchange rate. Under the same pollution source intensity, when the air volume is large, the indoor pollutant concentration is low. The better indoor and outdoor air exchange is, the faster formaldehyde and VOCs are released from building materials and decorative materials, the more conducive to indoor environment cleaning. Therefore, after the decoration of the house should pay attention to ventilation, increase indoor and outdoor air exchange. But "windy and unclean" will make the room more open windows for ventilation, and the air quality is poor.
(3) The influence of building structure. In order to let people enjoy the best environment, architectural design is particularly important. In the design process, lighting, ventilation and other conditions should be considered. In addition, the designer should first consider to prevent the spread of disease and the cross contamination of indoor air. In addition, the windward wind pressure and the building on the leeward side are too small to form an effective convection. Even if the ventilation condition is very good, it will also face the situation of "no wind". The diffusion of bad indoor pollutants will increase the threat of pollutants to human health.
(4) The comprehensive effect of indoor environmental factors. Indoor environmental pollution includes not only physical, chemical, microbial and other pollution factors, but also indoor temperature, humidity, wind speed and other factors. The results show that the indoor air temperature is 26 ℃, and volatile organic compounds (10 mg / M?) are mixed. There is a significant synergistic effect between air temperature and organic compounds on human health.
These are the factors that affect the diffusion of indoor air pollutants.