The main purpose of this project is to understand the current situation of air quality and the causes of pollution in Yunlin County, review the effectiveness and direction of the annual air pollution implementation plan, check the effectiveness of pollutant reduction to achieve the goal of improving air quality, work with Environmental Protection Administration to promote air pollution control planning, develop air quality improvement direction, plan short-, medium-, and long-term control objectives, and provide suggestions and guidelines for Yunlin County Environmental Protection Bureau to implement air pollution control in the future. This project was implemented from April 24, 2019 to April 23, 2020. The executive summary is as follows.
In terms of emission status and control, according to TEDS10.0, the total emissions of TSP, PM10 and PM2.5 for the base year 2016 of Yunlin County are 15,491 tonnes, 6,994 tonnes and 2,869 tonnes respectively. The main emission sources of TSP and PM10 are bare surface, households, agriculture, forestry, fishery and animal husbandry. The main emission sources of PM2.5 are manufacturing industry, land transportation, households, agriculture, forestry, fishery and animal husbandry. The annual emissions of SOX, NOX, NMHC and CO are 8,979 tonnes, 25,861 tonnes, 18,120 tonnes and 32,161 tonnes respectively, SOX, NOX and CO emissions are highest in manufacturing industry, and NMHC emissions are mainly in household and manufacturing industry.
In terms of air quality improvement, statistics of 4 air quality monitoring stations in Yunlin County show that although the annual average concentrations of PM2.5 exceed the air quality standards (35μg/m3), they still have improved year by year. The average values of SO2 and NO2 over the years have little difference, but also show a slight decrease trend. The 8th largest value in maximum hour of O3 shows an upward trend in Douliu and Lunbei, whereas a downward trend in Mailiao and Taixi. For air quality index (AQI), the proportion of good days (AQI<100) in 2018 reaches 83.3%, which increases by 12.9% from 70.4% in 2015. The number of Red Alert days for PM2.5 is 25 station days, which is also 91 station days less than 116 station days in 2015.
In terms of air quality deterioration contingency operations, the number of days of implementation of contingency is 145 days, and the main indicator pollutants are fine suspended particles. When the air quality is predicted to be poor, it should initiate the notification, investigation and return operation against poor air quality according to the regional air quality deterioration control measures defined by Yunlin County. It has totally reduced 229 tonnes of TSP, 43 tonnes of PM10, 10 tonnes of PM2.5, 17 tonnes of SOX, 4 tonnes of NOX and 23 tonnes of NMHC by investigating and dealing with major pollution sources and related pollution hot spots through various plans, while requesting all pollution sources to cooperate in reducing production and improve pollution control measures.
In terms of performance management of air quality maintenance or improvement plan, the results of each plan submission are compiled on a monthly basis, and the check operations are carried out on contents of each plan implementation, progress of each evaluation target project implementation and quality of the materials submission. In general, the quality of all plans and documents in this year is higher than that in the past. The main deficiencies are that the materials are not submitted within the time limit, the scheduled work progress is not completed within the time limit and the written materials are incorrect. Except for errors in the written materials requiring the plan to be amended on the spot, the remaining deficiencies all need to be proved and explained and are included in the enhanced verification.
In terms of public satisfaction questionnaire survey, a total of 378 valid questionnaires were obtained in this year. According to the results of the questionnaires, the public has a high sense of identity with regard to the pollution sources of factories or six light emissions in the county, the control of gasoline and diesel oil vehicles, open-air combustion, cooking fumes and environmental sacrifice, the promotion of low-pollution vehicles, the conversion of boilers in industrial areas to natural gas, etc., accounting for more than 50%. On the contrary, the public has a low sense of identity for air quality deterioration contingency operations, the replacement subsidy for gasoline and diesel vehicles, the control of outlying island industrial zone, the control of river dust, the road adoption operation of construction site, micro-sensor construction integrity and air quality improvement, and the proportion is about 30-50%.
In terms of developing and revising Yunlin County air pollution control plan, various air pollution control strategies of Yunlin County for 2020-2023 are formulated according to the air pollution control law revised and published on August 1, 2018 and the draft air pollution control plan in January, 2020, with a view of achieving the goal of PM2.5 of 20μg/m3 by 2023. In the future, the air pollution control vision is to upgrade the work safety, reduce the emission, and engage in environmentally-friendly practices. The countermeasures are to continue and strengthen various control measures, including 14 types of control objects and 35 control measures。
