This project carry out since April,2007, namely begins to understand the air quality improvement maintenance plan each sub-project work goal、contents、and the results，to use to evaluate project’s effects，after and further examine makes the suggestion. In order to analyze Chia-Yi city’s pollution source and the characteristic，the project more widespread collect meteorological data and emission detailed list from pollution source. The project execution period in order to control each sub-project to carry out rate of progress, and achieve the examination and critique goal from environmental protection administration(EPA), and the project give assistance environmental protection bureau(EPB) to convenes the work self-criticism conference way, invite to be responsible for air pollution control committee member to review the carry out results from each sub-project. The project’s result until Dec,2007 is refer to table 1. This is as follow the achievement explanation:
1. Environmental loading and variation trend
ChiaYi city ‘s environmental loading change from 1997 year to 2007 year is below: the number of population and vehicle(town buses、sedans、trucks and motorcycles) is raise year by year, and the population density is highest between another county or city from Yun-Chia-Nan air region. The incorporated in control factory number display downside . all investigation display the pollution emission ratio from population and floating dust will higher more and more.
2. Air quality status
The statistic data for psi>100 ratio from Yun-Chia-Nan air region past 13 year, it show the ratio is gradually down from 1994 year’s 5.3% to 2003 year’s 2.9%, but the last 3 years (2004~2006 year) is raise more and more to 2006 year’s 8.2%, this result indicate the air quality is go down in the last 3 years. But the ratio have down to 5.1% in 2007 year, that is better than 2006 year.
Else, from 1994 year to 2007 year, the NO2 concentration is decreased 45.6%, CO concentration is decreased 48.0%, SO2 concentration is decreased 35.9%, PM10 concentration is decreased 9.9%，only O3 concentration are arise 30.8%. Though the PM10、SO2、NO2 and CO average concentration/year gone down, but entire air quality is bad than near another county, only O3 average concentration/year is lower than near county . All investigation display Chia-Yi city have main pollution from suspension pollution.
3. The characteristic of pollution source
The characteristic of Chai-Yi city’s fixed pollution source is small and many，the most is restaurants and petrol stations and clearer and dyer’s. Though total emission quantity is not many, but emission structure is complex. Else due to Chai-Yi city’s land measure is not big, so it’s easier to become to focus the pollution source, that is hotspot of pollution source.
In the moved pollution source，though total quantity of motor vehicle and motorcycle is lowest than another county and city from Yun-Chia-Nan air region, but density is the highest. In the area source, Chai-Yi city has not many uncovered ground, but the TSP emission quantity from construction site is 9.8 ton/Km2 in 2007 year, that show to control the construction site is no brook delay.
4. analyze pollution emission structure
According to fixed pollution source database, to Dec,2007 end, each pollution emission quantity is below: suspension pollution has 106.3 ton, SOx has 26.4 ton, NOx has 226.3 ton, VOC has 341.8 ton and CO has 140.3 ton. The emission quantity from line of business, deal with junk has highest pollution quantity to 196.9 ton/year, petroleum industry has 191.6 ton/year is second, steel industry has 129.8 ton/year is third.
In the construction site source area, according to statistical data in 2007 year, the pollution quantity has cut down ratio is 46.2 from various construction. The biggest suspension pollution emission source is RC construction. The biggest pollution cut down ratio has 65.1% is for bridge construction, the SRC construction has 56.5% is second.
In the moved pollution source area, according to statistical data in 2007 year, Chai-Yi city’s total vehicle quantity is 274,823. Among total quantity, the motorcycle have 19,1762, the ratio is 69.8%. The sedans have 69,829 is second, the ratio is 25.4%. Chai-Yi city’s motorcycle density is 3,195/km2, and sedan density is 1,163/km2, all higher than Taiwan area.
5. review result from sub-project carry out
In the deliver paper timely area, 「The moved pollution source control project」and 「Diesel truck emission smoke Inspect project」have highest score is 100.
In the deliver paper integrity area,「Fugitive particulate emission control project」、「Carry out state and plead project for air pollution during night」、「Investigate and assistances to improve Chai-Yi city air pollution from temples & outdoor combustion control project 」、「Diesel truck emission smoke Inspect project」，these 4 project have highest score is 100.
In the achieved percentage of scheduled, 「Diesel truck emission smoke Inspect project」has lowest achieved percentage is 77.7% .
In the cut down pollution quantity in 2007 year, TSP has cut down 316.8 ton, TSP* has cut down 1060.7 ton, PM10 has cut down 301.8 ton, SOx has cut down 0.9 ton, NOx has cut down 1.1 ton, NMHC has cut down 82.6 ton, CO has cut down 50.1 ton. Except for 「Fixed pollution source control project」，another project reach objective for cut down pollution quantity.
6. Draw up air quality improve goal
The goal is reduce air pollution concentration in future 5 year, and get up to two-grade control region. 2007、2008 and 2009 year air quality bad ratio is down to 6.2%、5.7% and 5.1%.
7. Review and Plan the control tactic
Chia-Yi city have main air pollution is suspension matter and O3, the control emphasis is to control these pollution source.