This project covered the operation and maintenance works of Air Quality Monitoring Station (AQMS) in Tainan City in which assuring the normal conditions of facilities of AQMS and quality of sampling data, reporting the comprehensive maintenance records, summarizing the improvement measures as well as reporting latest conditions to Environmental Bureau. Taken into account assuring of maintenance work in compliance with standard of quality and assurance of AQMS this project included the formulation a set of standard operation procedures and maintenance form.
The major achievements of project, started from 1st February 2018 to 31st December 2018, were summarized as followings:
1. Air Quality Monitoring Station maintenance and Calibration Works
a). Maintenance Works of Analyzers and Samplers
Maintenance of Analyzers and Samplers was scheduled to be completed 264 times
throughout the contract term. From the planning period to 31 December 2018, it
completed 264 times of operation and achieved 100% completion rate.
b). Calibration Works of Analyzers and Samplers
As of 31 December 2018, One-point Flow Calibration and Multi-point Flow Calibration had been completed 264 times and 48 times respectively and achieved 100% completion rate. All calibration results were in compliance with the standard specifications.
c). The Monitoring results
Total suspended particulates (TSP) sampling analysis was scheduled to be completed 264 times throughout the contract term. From the planning period to 31 December 2018, it completed 264 times of analysis and achieved 100% completion rate. The monitoring results at all stations met the air quality standard (TSP 24 hour 250 μg/m3) since February to December 2018. The highest monitoring value was found at Xinshi station and the lowest monitoring value was found at Xinhua station.
Dust-fall collection and analysis was scheduled to be completed 66 times throughout the contract term. Until 31 December 2018, it completed 66 times of dust- fall collection and analysis and achieved 100% completion rate. Since February to December 2018, the highest monitoring value was found at Xinying station .And the lowest monitoring value was found at Anping station.
d). Air Quality Monitoring Station abolition assessment
Based on the station correlation, pollutant concentration level, environmental and resource allocation, as well as spatial distribution of stations, it was recommended to close the Minde junior high school station, the Xiejin elementary school station, the Yongkang district health station, the Sigang district health station and the Tainan Municipal Sinying elementary school station.
e). Assessment of equipment renewal in Air Quality Monitoring Station
Other than the aforementioned five suggested abandoned stations, facilities and equipment in Baihe district Health Station were recommended to be renewed or upgraded, followed by Tainan Municipal Madou elementary school station.
2.Operation, Maintenance and Calibration Works of Air Quality Monitoring Station
a.)Maintenance Works of Analyzers and Samplers until the end of December 2018
●Weekly maintenance works were completed 92 times
●Biweekly maintenance works were completed 44 times
●Monthly maintenance works were completed 22 times
●Quarterly maintenance works were completed 8 times
●Bi-yearly maintenance works were completed 4 times
●Yearly maintenance works were completed 2 times
b). Calibration Works of Analyzers and Samplers
Each analyzer conducted the automatic daily check. As of the end of December, the span drift check had not exceeded ±7 %, and the zero drift check had not exceeded ±2 %.
c). Data Validity
As of the end of December, Chengxili Station and Nanxi Station achieved 90% valid
data capture rate of the contract provisions.
d). The monitoring results
●WS/WD: Summarized the collected meteorological data from February to December in 2018, the highest wind speed (3.54 m/s) at Chengxili station was found in December, while the highest at (1.81 m/s) Nanxi station wind speed was found in February. Regard to wind direction, Chengxili station changed with seasons from the north wind to the south wind, while the Nanxi station was dominated by the north wind. In the air pollutant, as the Nanxi station is located in mountain region and less affected by fixed or mobile pollutant sources, leading that mostly measured values were lower than the Chengxili station.
Assessment of yearly average of measured parameters from 2017 to 2018
●PM10: According to the yearly average of PM10 of the stations from 2014 to 2018, both Chengxili station and Nanxi station had a relatively high value of 59 μg/m3 and 57 μg/m3 respectively over the years. The Xinying station of the EPA had a relatively higher measured value and the Tainan station of the EPA had relatively lower measured value.
●PM2.5: For Nanxi station, the yearly average 31 μg/m3 is the third highest over the years. In general, the measured values of these years (20 to 36 μg/m3) had no much fluctuation. The Xinying station and Tainan station of the EPA have relatively higher measured values and the Nanxi station had relatively lower measured values.
●SO2: The yearly average 2.3 ppb is the second lowest over the years for the Chengxili station. The yearly average 1.4 ppb is the lowest over the years for Nanxi station. Amongst stations, the Tainan station and Shanhua station of the EPA have relatively higher measured values and the Nanxi station had relatively lower measured value.
●NOx: both Chengxili station and Nanxi station had a relatively low value of 8.15 ppb and 5.90 ppb respectively over the years. Amongst stations, Tainan station and Annans station of the EPA have relatively higher measured values and the Nanxi station had relatively lower measured value.
●CO: The yearly average 0.33 ppm is the second lowest over the years for the Chengxili station. The yearly average 0.39 ppm is the lowest over the years for Nanxi station.
Amongst stations, Tainan station of the EPA and Nanxi station have relatively higher measured values and the Shanhua station had relatively lower measured value.
●O3: The yearly average 34.7 ppb is the second lowest over the years for the Chengxili station. The yearly average 25.3 ppb is the lowest over the years for Nanxi station. Amongst stations, Chengxili station had recorded relatively higher measured values while the lowest at Nanxi station.
●NMHC: The yearly average 0.19 ppm is the second lowest over the years for the Chengxili station. Nanxi station recorded 0.08 ppm and had no observable difference over the years (0.07 - 0.10 ppm). Amongst stations, Chengxili station had relatively higher measured values while relatively lower at Nanxi station.
e). Assessment of equipment renewal in Air Quality Monitoring Station
In 2018, Chengxili station had completed the renewal including the building of the station, gas dilution calibrator, meteorological pole had been replaced and purchased a new PM2.5 particulate analyzer. In 2019, Chengxili station is planned to continuous replace some equipment. To enhance the quality of the data, it recommended prior to allocate funds for replacement of PM2.5 particulate analyzer for Nanxi station and Total Hydrocarbon analyzer for Chengxili station.
3.Routine maintenance of LED electronic display broad
As the end of December 2018 a total of 334 pieces of daily air quality information were broadcasted, and 55 items (146 pieces) were broadcast for other assistance.
