The atmospheric pollutants can be classified into particulate pollutants and molecular pollutants according to their existing status. The gaseous pollutant monitoring includes SO2, NOx, CO, photochemical oxidants (03), etc. The six indicators of air quality monitoring in China are SO2, NO2, O3, CO, PM2.5 and PM10. With the development of environmental protection in our country and the deepening of environmental management, information technology has become an important technical basis for improving environmental management and decision-making. The State Environmental Protection Administration has clearly set out the goal of China's environmental informationization construction. It takes the environmental informationization construction as an important task in the construction of environmental management capabilities. It actively promotes the development of environmental informationization construction and provides good technical services and support for environmental management and decision-making. Environmental monitoring is an important part of environmental protection, is the foundation and technical support of environmental management, and air quality monitoring is an important part of environmental monitoring.

(1) Performance:

*Target gas: volatile organic compounds and the gas with ionizing potential lower than 10.6eV.

*Energy of the lamp: <10.6eV

* Temperature range: -20℃~+60℃

* Relative humidity range: 0%-90%R.H. (non-condensing)

* Response time: <3s(spread pattern)

* Output varies with temperature: +5%

* Temperature response: <1% full range @90%R.H.

* Humidity quenching: <15% @90%R.H.

* On-board filter: for liquid and particles’ filtration.

(2) Electrical characteristics

* Supply voltage: 3.2v-5.5v

* Current: 24mA-36mA

* Max. Linear output signal: 2.5v (Max.2.9v)

(3) Physical characteristics

* Weight: <8g

* Type of packing: urban technology tm 4p

* Location sensitivity: no

* Parts supply: lamp, electrode slice, filter, cap and filler piece.

* Life of UV lamp: 6000h or 1 year.

* Warranty: 24 months from the day of delivery( excluding lamp, electrode slice and filter membranes).

Types of sensors that may be used in the environment:

No.	Model	Product name	Detection gas	Detection range	Picture	Application
1	GD-PID	GD-PID sensor	TVOC	can be selected		1.Emergency response 2.Industrial health 3.Personnel safety 4.VOCs detection 5.Environmental quality monitoring 6.Petrochemical safety 7.Soil pollution and control
2	MQ-E3-SO2	SO2 sensor	SO2	0-20ppm(max 150ppm)		For detecting SO2 in industry or environmental protection field
3	MQ-E3-NO2	NO2 sensor	NO2	0-10ppm(max 100ppm)		For detecting NO2 in industry or environmental protection field
4	MQ-E3-O3	O3 sensors	O3	0-20ppm(max 100ppm)		For detecting O3 in industry or environmental protection field
5	MQ-E3-CH2O	CH20 sensor	CH2O	0-10ppm(max 100ppm)		Used for formaldehyde detection in industrial and environmental protection fields