use smoke and dust to sample.

Smoke control area refers to a certain area that is demarcated in accordance with legal procedures to strictly control smoke pollution sources in order to prevent air pollution caused by smoke. In China; Usually, urban streets and administrative districts are used as units to delimit certain areas: the blackness of flue gas emitted by various boilers, kilns, tea stoves, business stoves and canteens, as well as the concentration of flue gas emitted by various furnaces and industrial production facilities, are quantitatively controlled to reach the prescribed standards. Smoke and dust control areas shall be accepted by people's governments at all levels. To reach the standard of smoke control area, the certificate of smoke control area will be issued and praised. The completed smoke control area shall be reviewed regularly. If it fails to meet the standards of smoke control area, the certificate of smoke control area shall be withdrawn and corrected within a time limit.

established in 2114, Shanghai jingfei environmental protection technology co., ltd. is a leading high-tech innovative enterprise integrating the development, design, manufacture, sales and service of online water quality analysis instruments and online water quality monitoring instruments and systems in China. The company is committed to the production and development of electrochemical sensors, the research and development of online water quality monitoring instruments and online monitoring systems, and the product application. The products involve online water quality multi-parameter sensors (conventional five parameters: PH, dissolved oxygen, temperature, conductivity and turbidity), online ammonia nitrogen, residual chlorine, ORP, turbidity, optical dissolved oxygen, PH, nitrite sensors and system integration, etc., which are environmental water monitoring, surface water monitoring, sewage monitoring, aquaculture and so on. Since its inception, the company has set up a high-quality technical team, including experienced industry experts, senior engineers, doctors, masters and other scientific and technological elites. While making full use of its own technical development capabilities, the company has also maintained long-term good cooperation with Donghai Station of Institute of Acoustics, Chinese Academy of Sciences, Shanghai University and other institutions to jointly develop scientific and technological products. In order to ensure the quality of products, the key raw materials are imported from abroad, and the manufacturing technology and process of products are under strict monitoring.