First of all, the influence of humidity on air quality is realized by the diffusion of particulate matter in the air. Water molecules are small and easy to attach to larger particles, such as dust, pollen, bacteria and so on. When the humidity is high, water molecules will attach to these particles more easily, making them heavier and easier to settle. Therefore, in the high humidity environment, the particles in the air will gather together, reducing their diffusion in the air, thus reducing the air quality.
Secondly, in high humidity environment, the reproduction speed of microorganisms such as bacteria and molds will be accelerated. These microorganisms will release some substances harmful to health, such as bacterial endotoxin and volatile organic compounds, which will aggravate the degree of air pollution. In addition, the high humidity environment will also lead to indoor humidity, promote the mildew and decay of indoor decoration materials, and thus make the air quality worse.
However, in low humidity environment, particles in the air tend to be more dispersed, because water molecules are not easy to attach to particles. In addition, in low humidity environment, the reproduction speed of microorganisms will slow down, thus reducing the degree of air pollution. Therefore, in a suitable humidity range, such as 40%-60%, the air quality will be better.
In a word, humidity has an important influence on air quality. In the high humidity environment, the particulate matter in the air will gather, and the microorganism will multiply faster, thus reducing the air quality; However, in the low humidity environment, the particles in the air are more dispersed, and the reproduction speed of microorganisms is slowed down, thus improving the air quality. Therefore, maintaining a suitable humidity range is very important for maintaining good air quality.