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Baotou (40°15-42°43N, 109°15-110°26E) is located to 670 km west of Beijing ().It is a typical heavy industrial city in Northern China, with an area of 27,768 km 2 and a population of approximately 2.8 million. The average annual precipitation is 240400 mm which mainly occurs from July to September.China Manufacturer Wholesale 4 Element Air Quality , tzcp 2007 china manufacturer pm2 5China Manufacturer wholesale 4 element air quality measurement device temperature humidity pm2.5 pm10 air quality sensor outdoor. BGT-PM2512 Detecting the concentration of particulate matter with diameter less than 2.5 microns and less than 10 microns in the air.The principle of laser scattering is adopted, that is, the laser is irradiated on the suspended particulate matter in the air to , tzcp 2007 china manufacturer pm2 5Ventilator - Shanghai Shiyu Machinery Group Co., Ltd , tzcp 2007 china manufacturer pm2 5China Ventilator catalog of Stock Available Ventilator/ Ce Certificate Ventilator/ ICU Ventilator, New Design, Home Style, Air Treatment, Pm2.5 Air Purifier, Eco-Clean Engergy Recovery Ventilator provided by China manufacturer - Shanghai Shiyu Machinery Group Co., Ltd., page1.

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