The data of Air Quality Index (AQI) until November 2020 in Taitung and Guanshan stations showed that days with “good” level (AQI <50) were 92.8% and 94.9% respectively, days with “normal” level (AQI 51-100) were 6.9% and 5.1%, days with AQI over 100 were 0.3% and 0.0%, all the air quality index items met the air quality standard, and the concentration trends of O3 hourly 98th-percent average and O3 8-hour 93th-percent average were increased. The further analysis showed that the hourly concentration trend of each pollutant during 2016-2020 was similar. For these two stations, the pollution of PM10, PM2.5, NO2, and CO were significantly improved compared to the previous 5 years.
According to the model of TEDS10.1, total emission amount of TSP, PM10, and PM2.5 based on 2016 would be 10,284, 4,644 and 1,827 tons, mainly contributed by construction and road dust, followed by industry and open burning; the annual emission amount of SOx, NOx, NMHC and CO would be 180, 2,947, 4,890 and 6,483 tons, SOx is mostly from industry, NOx and CO are mostly contributed by vehicles emission, and NMHC is more from business, vehicles, construction or road dust. The mini-scale simulation result of back-trajectory model of Guanshan station in June 2019 showed that Guanshan and Chishang were surrounded by Coastal Mountains and Central Mountains so that pollutants retarded, and contamination concentration was increased.
In 2020, the number of times of air quality deterioration warning was still 0 until November. This project executed simulation drill of Beinan River dust in August 26 and October 28. Through the online and practical drill, let concerned departments be familiar with process.
The air pollution control project(2020~2023) drew up 18 control targets, including decreasing 542.47 tons of PM10, 251.37 tons of PM2.5, 10.56 tons of SOx, 86.72 tons of NOx, 44.72 tons of NMHC. According to the air pollution features of Taitung County, set the local air pollutant concentration goals and track the monthly progress.
For the indoor air quality management, according to the indoor air quality performance evaluation of Environmental Protection Administration, Executive Yuan (EPA), three types of non-announcement management places including junior high schools, elementary schools and kindergartens(total 50 places) were conducted the CO2 inspection this year, and 4 of them had the concentration over 1000ppm, 7 of them had the concentration between 600~750ppm, 5 of these 50 places had been chosen for specific items inspection base on the category of each place. For 9 announcement management places from the first batch and the other 9 from the second batch announced by EPA, all installed dedicated personnel and been certificated by the competent authority, all of them conducted the regulated inspection, and all the information had been saved in system of Taitung indoor air quality database.
