(1)Environmental Loading and Trend
The amount of population in Tainan City is 1.885 million, and the density is 860.2 people/km2 which continues to grow every year. It is ranked sixth in six municipalities. The amount of factory in Tainan City is 8831, and the density is 28.9 factories/km2. The amount of controlled factory is 2282 in which the plastic products industry is 362(15.9%), followed by the metal industry is 296 (13%), and then the gas station industry is 290 (12.7%) and metal surface treatment industry is 208 (9.1%). Construction sites tend to decline in 2015, the amount of current site is 9688, of which 3120 at first class and 5399 at second class.
The amount of vehicles in Tainan is 1.937 million, and every person has 1.03 vehicles, of which the number of automobiles is 540,000 and the number of scooter is 1,280,000. The number of vehicles in recent years have shown a trend of growth. In 2011, the number of scooters had a negative growth. In the amount of fuel supply and gas stations are showing the trend to reduce, the amount of fuel supply is from 1,182,000 kiloliter in 2005 to 1,086,000 kiloliter in 2015, down 8% in recent years; the amount of gas stations decreased from 302 stations in 2005 to 277 stations in 2015.
(2)Air Quality Status and Analysis
The percentage of bad air quality in Tainan City falls from 7.62% in 2006 to 0% in 2015, and the percentage of good air quality raises to 36.2% in 2015 which set a new record that showed the control strategy in Tainan City have been effective in recent years.
The concentration of air pollutants showed improved trend, in which the PM10 daily average and year average are the first time below the regulatory standard value.
Analysis of monitoring data from 2006 to 2015, PM10 annual average improvement rate was 26.6%, daily average improvement rate was 22%; PM2.5 annual average improvement rate was 37.2%, a 24-hour average improvement rate was 29%; O3 hour average improvement rate was 18.6%, eight hours average improvement rate was 15%; SO2 annual average improvement rate was 33%, hour average improvement was 34.5%, NO2 annual average improvement rate of 23.7%, the hour average improvement rate was 24.2%; CO hour average improvement rate was 19.8%, eight hours average improvement rate was 11.4%. In the long term trend showed that policy directions have been correct, and the improved strategies of air quality have been effective.
PM2.5 index value in Tainan City, low-grade (≦ 35 µg / m3) increased from 65.8% (2014) to 73.9% (2015), while high and very high-grade (≧ 54 µg / m3) decreased from 10.2% (2014) to 8.2% (2015), showing the city's PM2.5 has improved.
(3)Air Quality Modeling Analysis Results
For four months (January, April, July and October) of simulation in 2010, analysis reduction strategy promoted of PM2.5, and PM10 and O3 air quality improved effectiveness, assessment Tainan City reached degree of air quality target.
Assessment results except PM10 year’s average and the O3 maximum hours value in 2020 can reached air quality standard, the remaining pollutants still cannot reached air quality standard.
(4)Analysis of emission source structure
According to the TEDS 8.1 emissions database and the results of this review update, TSP is 39,860(tons/year), PM10 is 14,316(tons/year), SOx is 4,404(tons/year), NOx is 27,437(tons/year), and NMHC is 46,048(tons/year).
(5)Reviewing and amending the Air Pollution Control Strategy
Air pollution control targets total 74 items, including fixed, mobile, fugitive sources and convenience measures. Overall, there are good achievement rate in each plan.
For suspended particles rendering deterioration case in 2013, assisting EPB developed suspended particles control action plans, for 9 items are easy to produce suspended particles of pollution source, established control target, developed 37 items action control strategy to hope suspended particles and the fine suspended particles annual average concentration reached 65 µg/m3, and 15 µg/m3.
SIP assisted to amend the air pollution control plans in 2015 in Tainan, planning of air pollution control targets and management strategy, including stationary sources, mobile sources, and fugitive sources that total 16 strategies and 59 control goals.
(6)Management quality and effectiveness in each air quality control plan
i.review the evaluation performance of EPA
In the Environmental Protection Administration Assessment Result Review, the appraisal result of 85.22 points announced by the Environmental Protection Administration in 2014 is excellent distinction is obtained in the assessment amongst six special municipalities.
ii.In regard to the processing of quality and result in the management of the air pollution control plan, the 「Management and Assessment Grading Method for the 2015 Tainan City Air Improvement ＆ Maintenance Project」 is formulated and management and assessment grading is conducted on various plans.
iii.In the execution of key projects, the score of the 「Diesel Vehicle Dynometer Smoke Emission Detection Project」 is the highest.
(7)Public satisfaction survey
Public satisfaction survey result showed that 68% of people are satisfied that Tainan City Environmental Protection Bureau's efforts which improve air quality.
(8)Maintenance and management of air quality purification zone
i.Number of air quality purification zone sites increased from 2011 (192) to 2015 (220) , including 23 green parks, 10 green Road, 187 community greenbelt, with a total area of 78.45 hectares and 74.24 km.
ii.Setting grant applications totaling 10 bases in 2015, after reviewing the full approval, total area of 0.7902 hectares; purification zone maintenance grant funding for a total of 94 bases made applications for the amount of 1,917,010 dollars, 1,910,240 dollars subsidy to be verify.
iii.Each purification zone routinely performed twice, for a total evaluation of 376 times. Get 90 points or more bases had 34; 81 points to 89 points bases had 128; 80 points or less bases had 26.