Our country in 2001 in Taichung City Park to set up the first Chonglun photochemical stations, as the largest in Central Office VOC have the upper hand on behalf of the district stations have been operating 5 years, the number of monitoring data and has reached the stage of the task Demand. In order to further our understanding of the Chiayi area of ozone pollution cloud the issue, in 2007 to stop the relocation of Chonglun photochemical Township, Yunlin County of Taiwan to monitor the trend of changes in the ozone precursors.

As the Nantou area in the spring and autumn each year often high ozone events, the 2002 planning another two stations (Chushan photochemical photochemical Tsaotun station and stations), Nantou County, Chushan area for the largest formation of ozone on behalf of the district, and in the middle Transfer stations set point - photochemical Tsaotun Station, Taichung and photochemical Chonglun stations constitute the upper and lower winds, the monitoring network in the hope of such by the upper and lower winds, with a view to monitoring the use-by-time data interpretation Under high wind environment, the ozone formation mechanism and Chonglun stations to form a high VOC emissions and ozone have a high correspondence. In order to further our understanding of the Chiayi area of ozone pollution cloud the issue, in 2007 the relocation of photochemical Chushan Station to Tainan City, Tsaotun photochemical Puzih Station to the city of Chiayi County to monitor the trend of changes in the ozone precursors.

Our country's central station network planning photochemical only consider the PAMS station network in which the two were Chonglun Taichung (type2) stations, Nantou Chushan (type3) station, and then joined the middle-point transmission verification of the Nantou Tsaotun station. Of which the Nantou and Taichung station Chonglun Chushan standing next to the station next to the Environmental Protection Department set up the station's air quality, materials and air stations have NOx, ozone, wind speed, wind direction, the equivalent radiation measurement instrument, can make use of its advantages These instruments measure the comparability of data between the control and explore the upper and lower wind Department between changes in the concentration, transmission, as well as the role of the relationship between the photochemical to explain the causes of the phenomenon of high ozone.

Consideration in the northern and southern parts of ozone precursors to monitor demand in 2006 in Taipei's Wanhua, Taipei, Tucheng, Taipei County; the Kaohsiung-Pingtung area of the bridge, Taliao (in 2007 moved to Kaohsiung) and the re-erection of Chaozhou A photochemical station, become a regional air monitoring network up and down, making the current total number of stations into 8 stations, of which related to layout design of the location of the 1-3. At present, all the photochemical are next to the station next to the Environmental Protection Department set up by the air quality stations, the main advantages can be used for air quality stations within the NOx, ozone, wind speed, wind direction, radiation measurement instrument, such as the existing control device with each other Helps to explain the phenomenon.

【Diagram 1 - Taiwan's 2007 photochemical station map】

Photochemical station network set up

Our country's 1990 reference to the U.S. Congress passed the Clean Air Act provisions of the amendment (Clean Air Act Amendments), U.S. Environmental Protection Agency requirements of state or local ozone problem in the region must begin to build photochemical assessment monitoring stations (Photochemical Assessment Monitoring Stations; PAMS, hereinafter referred to as photochemical Station) Comprehensive monitoring of ozone, ozone precursors and some of the oxygen-containing volatile organic compounds (VOCs) in order to understand the reasons for the occurrence of high ozone. U.S. Environmental Protection Agency clean in the implementation of the law 18 months have also enacted laws and regulations as to strengthen the monitoring of ozone-before becoming the basis for the implementation of state laws and regulations must be in accordance with the requirements of the establishment of PAMS, for O3 in the air before the trend-monitoring, and to the strengthening of NOx And understanding the source of VOC emissions, so that the formation of the PAMS is the beginning of construction under the law. PAMS of ozone precursors and its main purpose of monitoring is to provide accurate and representative of long-term data, so that the air pollution control units and so be able to immediately grasp the objective of air quality situation, the establishment of a complete concentration of ozone and its precursors, weather conditions The relationship between each other to find out the causes of ozone, the last to develop feasible strategies to control ozone.

Photochemical our network in principle by the four types of measuring stations, namely the upper hand and the background characteristics of the station (type1), the highest concentration of ozone precursors Station (type2), the highest concentration of ozone stations (type3) with the wind under a Yuan Station (type4), as shown in Diagram 1-2, can be divided into four points to:

1. The upper hand and the background characteristics of the station (type1): This station to confirm the upper hand to provide the necessary amount of ozone transmission of information, including the upper hand and their precursors of ozone monitoring. The station will be located in the direction of the upper hand in the morning and the prevalence of background ozone precursors of the highest concentrations of a suitable site.
2. The maximum concentration of ozone precursors Station (type2): the main station in the district will monitor the emissions of ozone precursors Morphology and quantity. The station's location should be elected in the elections and stop the type 1 in the morning the direction of prevailing winds will be even close to the main source of the border. The region should be much more than a stand on the second morning of the direction of prevailing winds.
3. High concentrations of ozone stations (type3): the main station in the monitoring in the immediate vicinity of the highest emissions of ozone precursors of the wind under the Department of the remainder of the VOC, should be located in the metropolitan area from the edge of about 20-40 km Department.
4. Under the wind very far stations (type 4): standing on the understanding of the ozone precursors and the long-range transmission. The station should be set up in the afternoon, under the prevailing wind direction and close to the edge of the next Style.

【Diagram 2 - photochemical principles of the monitoring network set up】

Future

• In order to further our understanding of the Chiayi area of ozone pollution cloud the issue, in 2007 to move Gwanghwamun area in central Chiayi Station to cloud the region to monitor the trend of changes in the ozone precursors. Sampling to avoid obstructions near the mouth of the concentration of air pollutants and interference.
• Ongoing in the north and Kaohsiung-Pingtung area monitoring stations photochemical analysis of the data so as to provide reference to the ozone pollution control strategies.