·Smart card analysis of pollution sources, Nanjing exhaust emissions are accurate

On the road, one monitoring probe, in addition to the capture violation, can also record the "contribution" of each car to PM2.5.
Recently, it was led by Nanjing Motor Vehicle Emission Control Supervision Center of Nanjing Province, led by Nanjing Urban Intelligent Transportation Co., Ltd., and the city vehicle exhaust emission calculation project jointly developed by Tsinghua University and Nankai University was successful.
It is reported that this system can accurately calculate the total amount of urban vehicle exhaust emissions and will be the first to be applied in Nanjing.
The vehicle smart card records the exhaust emission data. The environmental protection electronic card installed on each front windshield can not only “tell” the monitoring probe whether the vehicle is a yellow or green label, whether it is illegal or not, or an information integrator.
According to Yuan Gaofeng, deputy general manager of Nanjing Urban Intelligent Transportation Co., Ltd., the environmental protection electronic card is also called the RFID vehicle smart card. Vehicle brand, factory time, displacement, mileage, including exhaust emissions data collected during each annual inspection, can be queried by smart card.
The 500 smart card base stations installed in the city's roads transmit the exhaust emission data of each vehicle through the Internet of Things to the Intelligent Transportation Company's back-end big data analysis center by sensing the smart card information passing through the vehicle. In this way, the exhaust emissions of all sections of the city every day and throughout the year can be accurately calculated.
“The traditional method of calculating exhaust gas is based on the total number of vehicles in the city, the total number of roads, and the average speed of the vehicle. The accuracy is not high.” Yuan Feng said that the data of this system comes from each vehicle, and the calculation result is more accurate.
The concentration of road pollutants is clear at a glance. Currently, there are 1.5 million vehicles in Nanjing, of which 1.35 million are equipped with smart cards. These smart cards are like one information terminal. Through calculation, PM2.5 and nitrogen oxide production in all sections of the city can be measured to the nearest kilogram per hour.
At Urban Intelligent Transportation Co., a programmer operated the system on site. On the programmer's computer screen, the traffic volume of each road in the city is clear at a glance.
Roads with many vehicles are shown in red, followed by yellow, and roads with fewer vehicles are green. I saw that the road around Longjing Middle Road was “a red”, and the traffic flow to the outside was much less. The traffic outside the road outside the city was the smallest.
The programmer clicked on another operating command of the system, and the exhaust emissions of each road were immediately displayed on the computer screen.
The system shows that the three roads with the highest concentration of PM2.5 and nitrogen oxides are Xuanwu Lake Tunnel, Xuanwu Avenue and Longjing Middle Road. The three roads with the highest concentration of carbon monoxide are Xuanwu Lake Tunnel, Longjing Middle Road and Xuanwu Avenue. The concentration of road pollutants outside the inner ring is relatively low.
According to the analysis of the programmers, Longjing Middle Road and Xuanwu Avenue are the two busiest roads in Nanjing. There are more congestions in the morning and evening peaks, so the exhaust emissions are the largest; the Xuanwu Lake Tunnel and the Longjing Middle Road Tunnel have a large traffic volume. Exhaust gas pollution in the tunnel is not easy to spread, so the PM2.5 concentration is high.
During the year, citizens can use mobile phones to watch data for free. Motor vehicle exhaust is an important source of atmospheric pollutants PM2.5 and nitrogen oxides, and motor vehicle emissions are highly close to the respiratory tract, which has a great impact on the human body, especially children.
Yuan Gaofeng said that the purpose of calculating the total amount of vehicle exhaust emissions is to provide data support for urban vehicle exhaust pollution control.
The reporter saw on the operation platform of the Urban Intelligent Transportation Co., Ltd. that in addition to calculating the PM2.5 and nitrogen oxide concentration, this system can also measure pollutants according to the vehicle emission standards and single and double numbers on the roads of the city. The change.
Take a certain time period as an example. How many yellow-label vehicles are driving on the road during this period, and how much exhaust emissions are “contributed”, so that the amount of pollution that can be reduced after all the yellow-label vehicles are eliminated can be calculated.
Similarly, if a single or double number limit is implemented or converted to a one-way street in a certain section, the amount of pollution reduction can also be calculated; in addition, diversion measures can be taken according to road congestion to reduce air pollution.
The person in charge of the Nanjing Motor Vehicle Emission Control Supervision Center said that in addition to measuring exhaust emissions, this system has an important application, which is to calculate and predict the city's air quality by calculating the pollutant discharge of more than 3,000 roads in the city.
At present, this system has entered the final testing stage and will be put into use within the year. At that time, the public can download the mobile phone software "Zhihang Nanjing" to view road congestion information and exhaust gas data for free.

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