Nearly half of the world's people are exposed to indoor air pollution, and indoor environmental pollution has caused 35.7% of respiratory diseases, 22% of chronic lung diseases and 15% of bronchitis, bronchitis and lung cancer. The annual number of deaths caused by indoor air pollution in China has reached 111,000, with an average of 304 people per day. The indoor space is the main activity area of people. We provide comprehensive and professional indoor air testing services to accurately quantify toxic and harmful substances such as formaldehyde, benzene, toluene, xylene, ethylbenzene and TVOC in daily work and living space. Air hazards protect the healthy living and working environment.