Indoor pollution from a wide range of sources, and local management of the whole environment is limited to improving the indoor air...

Harmful gases indoors 1. Radon Radon is a radioactive noble gas that is colorless and odorless. Found in cement, sand, and gravel. Radon...

The fresh air system is used to ensure the quality of the indoor air environment, but the fresh air outlet for long-term use, the outlet...