In order to effectively integrate the achievements of air quality improvement and maintenance work, the project mainly traces the progress of the implementation of various air pollution control strategies for purpose of good air quality in Chiayi City. The implementation period of this year's project is from February 20, 2021 to December 15, 2021. Progress has been completed. The summary of the main work is as follows：
Based on the 5-year monitoring data between 2016 and 2020, the annual average concentration of PM10 has decreased 31% in Chiayi air quality station, while PM2.5 (manual) has decreased 26%, PM2.5 (automated) has decreased 29%, and O3-8hr-93% top value has decreased 8%. The concentration of PM10 in Chiayi City has been under the standard of class II control regions, while PM2.5 and O3-8hr still remain in class III control regions.
As of November of this year, the red alert poor air quality station days(AQI≧151) has obviously increased from 1 day in 2020 to 11 days in 2021, resulting from abnormally low mixing layer, stable weather condition, and low wind speed, which makes local pollutants hard to diffuse, plus with the importation of abroad pollutants.
The new coronavirus epidemic broke out from May to July, 2021. Air quality analysis has been made before, during and after the epidemic by considering weather condition and energy consumption intensity, then compare to the same period in 2018 and 2019. Before the epidemic outbreak in 2021, it was an air pollution season with low rainfall days, high incidence of northerly winds, low wind speeds, and increased energy consumption in the industrial and transportation sectors, resulting in higher average and maximum concentrations of pollutants. During the epidemic, the incidence of northerly winds was high, energy consumption in the industrial sector increased, and the average concentration of pollutants was higher, while energy consumption in the transportation sector decreased during the same period, along with high rainfall days and high wind speeds, resulting in a lower maximum concentration of PM2.5 and NOx. After the epidemic, the incidence of northerly winds was low, the number of rainy days was high, and energy consumption in the transportation sector decreased. During this period, the average concentration was low, but the maximum PM2.5 value was high. This is related to the high activity intensity of the industrial sector.
Based on TEDS 11.0 database, the annual emissions in Chiayi City are PM10-556 tons/y, PM2.5-226 tons/y, SOx-36 tons/y, NOx-1,130 tons/y, NMHC-3,967 tons/y, respectively. Compared with TEDS 10.1 database, the emissions have reduced by 7%~39%.
This project also assisted in the edition of the Chiayi City Air Pollution Control Plan(2020~2023). After three times of review, it was approved on October 7th. A total of 34 control strategies were drafted, including 8 strategies for stationary pollution sources, 10 strategies for fugitive pollution sources, and 12 strategies for mobile pollution sources, and 4 strategies for comprehensive controls. In 2020~2023, the reduction targets for PM10, PM2.5, SOx, NOx, and NMHC are 108.16, 58.71, 14.02, 534.88, and 518.57 tons/y respectively. Seasonal 19 control strategies were also proposed, and the quantification and reduction results in the second and the third quarter were collected.
In terms of model simulation, CMAQ was used to simulate source contribution ratio of PM2.5 of 5 specific pollution sources in Chiayi City. It turned out that strengthening the control strategies of diesel vehicle from other seven counties has substantial benefits to improve the city's PM2.5 air quality. Besides, by the simulation according to control strategies of Air Pollution Control Plan in 2023 of the seven counties, reduce the native PM2.5 in winter has substantial benefits in Chiayi City. The O3 concentration in Chiayi City has decreased in the inland areas, while the western urban area has increased, which is related to the weak O3 titration effect caused by amoumts of NOx reduction and the excessive reduction of NMHC.
To assist EPB to participate in "Air Pollution Interregional Cooperation Prevention Response in Southern Taiwan" for 15 times; to hold three "work performance review meeting" in April, August, and October; to hold clean air promotion committee meeting in June and December; to hold the air quality deterioration drills for pre-meeting and official meeting. From January to November, a total of 95 notifications of poor air quality were implemented, divided into 3 categories: PM2.5, O3-8hr, and PM10. Among them, the number of PM2.5 notifications reached 83 times accounted for 85%, O3-8hr reached 15 times accounted for 15%, and PM10 did not occur.
There are 7 air quality purification areas in the city with a green area of 4.25 HA、6.8 KM, including 3 bare green areas, 2 environmental parks and 2 bicycle lanes, which all have been managed and maintained by groups or organizations, including 5 companies accounted for 71%. In May and September, experts and scholars were entrusted to conduct internal inspection and evaluation.
In 2021, a total of 20 air pollution prevention and protection advocacy activities have been held, including 5 propaganda are scheduled for seed lecturers. With rewarded quizzes or games to interact with the public, 7,824 people participated in. Animation of "How to protect yourself in the day of red alert air quality" and "Do not open burning" have been produced. To use social media to publish knowledge about air pollution prevention and protection regularly. Press releases have been published twice in the newspapers, China Times and United Daily News. Besides, "Chiayi City integrates cross-bureau resources to show outstanding results in air quality improvement" won the EPA's special award.
In 2020, the Chiayi City's annual assessment results were assessed by the EPA, Chiayi city's performance score was over 85, which was evaluated as "Excellent". Until the third season of 2021, the self-assessment of air quality improvement work performance evaluation scores 77, while annual evaluation scores 91.7. We also have assisted in reporting and uploading the first to third quarterly reports, monthly reports from January to September and Air Pollution Control Fund-related statistics.
