This project from 2008 year in March carries out, namely begins to understand that this city air quality improvement maintenance plans each sub-planning work goal, the content and carries out the achievement Appraises carries out the result, after and further examines, makes the suggestion.In order to grasp Chia-yi city air source of pollution characteristic and the origin, this project more widespread collection this city meteorological data and various sources of pollution emissions detailed list, pushes estimates analyzes this city source of pollution emissions characteristic. Plan execution period to grasp each plan to carry out the progress, achieves the environmental protection administration(EPA) examination goal, then the assistance environmental protection bureau(EPB) convenes the work self-criticism conference way, carries on view of each plan carries out tracing of self-criticism the result. achievement of quantification table 2008 year this plan execution asks reference table 1 to show,this is as follow the achievement explanntion：
1. Environment loading and variation trend
Chia-yi city up to from 1997 to 2008 years the environment loading change, population of change the Chia-yi city recent years was not big, but the bus, used for oneself the passenger vehicle, the pickup truck and the locomotive has the small scale growth, but the labor factory several presented negative growth the tendency. The area of jurisdiction population density is in the Yun-Chia-Nan air region the highest, Chia-yi city from 1998 years the tendency which to 2008 year gross population is presents increases year by year, its growth rate approximately is 3.3%, at present the population density approximately for each square kilometer 4,561 people, approximately 7th times for Taiwan area population density, the entire province places fourth.
Although in the industry and commerce part, the Chia-yi industry and commerce registration counts in recent years presents the growth tendency, however has the drop slightly to 2008 year, but arranges in order plumber factory number in the recent 4 years also to present negative growth. Along with this city population and the state development, demonstrated the population growth brings the transportation and the escape pollution account for the proportion to be able to be getting higher and higher.
2. Air quality status
Statistical past 15 year Yun-Chia-Nan air region PSI > 100 proportions, has dropped to 2.9% 2003 year from 5.3% by 1994 year , thus it may be known air quality improvement measure in this period had display certain result. However 2004, 2005 years actually rise to 6.0%, 6.3% (2004 year nation various survey stations bad date universal enhancement), 2006 years reach as high as 7.0%, demonstrated that the overall air quality has tendency of the worsened in the nearly 3 years, But in 2007 year spatial fraction defective drop is 5.1%, demonstrated that the air quality worsening has slows down the situation; 2008 year eliminate because of the first season the sand storm influence, cause this year PM10 the bad station date 2007 year to increase 23 station dates, the overall this year bad station date percentage is 4.63%, overall air quality condition 2007 year for good, 2008 year PM10 bad station date number as a result of the beginning of the year sand storm and the meteorological influence, has been higher than for 2007 year, but the O3 part 2008 year bad station date total 50 station dates still far were lower than 2007 year 118 station dates the bad date number.
Chia-yi city from 1994 years to 2008 year at the end of December, the CO density drops 50%; The NO2 density drops 45.7%; The SO2 density drops 34.3%; The PM10 density drops 10.03%, the Uygur O3 density rises 24.1%. Although SO2, NO2 and the CO annual mean density change presents the declining trend, however the whole air quality was still close to the county city bad, over the years only the ozone annual mean density value is lower than the neighbor county city, 97 year PM10 density besides fights six stands all compare other county city survey station to lowly.
3. Characteristic of pollution source
Characteristic of the Chia-yi city’s fixed source of pollution to be small and be many, the most is restaurants and petrol stations and clearer and dyer’s. Although the total withdrawal is not big, but its emissions structure is quite actually complex, moreover because Chia-yi city’s breadth is not also big, therefore easy to form the source of pollution to be centralized, unit area's withdrawal, easy to form the pollution source .that is hotspot of pollution source.
Although the motion source of pollution aspect, the steam engine vehicle the total quantity is lower than the Yun-Chia-Nan air region, but because breadth of the Chia-yi city is small, therefore speaking of the density comes first of high Yun-Chia-Nan air region. In surface source aspect, because Jiayi is can the state, therefore the exposed ground are not many, builds the project namely to have TSP 9.8 ton/km2 in 2007 year , then TSP 4.65 ton/km2 in 2008 year.
4. Analyze pollution emissions structure
Collects according to the fixed source of pollution source database, to Dec,2008 end, present stage each kind of source of pollution for the suspension pollution has 97.3 ton , the SOx has 31.1 tons, the NOx has 158.9 tons, the VOCs hss 268.7 tons and the CO has 75.1 tons.Various professions account for percentage of the various pollutant for instance by the total quantity, take the petroleum refining industry as 197 metric ton/years for highest; Next total withdrawal 84.8th metric ton/years for reject processing industry; The steel and iron casting industry is 83.4 metric ton/years occupies three; The gas station industry is 55.6 metric ton/years occupies four.
In the construction site source area, demonstrated of statistical data according to Dec,2008 year present stage, 2008 year reduces rate approximately between 27.4%~62%, reduction rate is 51% equally. Builds the project emissions escape dust take other projects as the most large amount, next is the RC project, the road engineering occupies three, reduction rate reduces take the SRC project rate approximately as 65% results is best, the bridge building reduces rate is 59% next bests.
In the moved pollution source area, Statistics of number of vehicles according to Dec,2008 year, the Chia-yi city present total number of vehicles approximately is 280,976, the locomotive number is 198,781, approximately composes 70.7% total number of vehicles, next is the passenger vehicle number, approximately is 69,177, accounts for 24.6% total number of vehicles. Says number of vehicles of by the unit area, Jiayi each square kilometer approximately has 3,312 locomotives, each square kilometer approximately has 1,152 passenger vehicle, is higher than Taiwan area each square kilometer 398 locomotives and 157 passenger vehicle.
5. Review result from sub-projrct carry out
In the material submission aspect, “strengthens the street to advocate the dust to wash the street porject” to be best in the material submission time-limited part, the score is 100 points, has not had the detention to pay situation of the material.
Each project the job schedule agreement rate part the job schedule agreement rate part “Carry out state and plead project for air pollution during night” each month job schedule accumulation agreement rate equally as 100% highest, for a work agreement rate more perfect plan.
Statistics of number of vehicles according to Dec,2008 year, raises the complete aspect in each month material, each sub-project checks the score to have above 90 points, demonstrated each sub-project submits the material all has certain integrity.
In the cut down pollution quantity in 2008 year, TSP reduces 219.49 metric tons, TSP* to reduce 464 metric tons, PM10 to reduce 211.81 metric tons, SOx to reduce 12.11 metric tons, NOx to reduce 1.22 metric tons, NMHC to reduce 155.91 metric tons, CO to reduce 837.36 metric tons. This year each plan reduces the quantity to be mostly close or to surpass the year decrement goal.
6. Draws up the air quality improvement goal
The the environmental protection administration(EPA) according to the county city present air quality monitoring data, calculates each kind of pollutant air pollutant density and air quality standard ratio, because PM10 of this city has not reached the air quality standard, therefore this project lists as three level of against system areas, in this, how does this city air pollution against system plan with emphasis reduces the air pollutant density in 5 years, and drops to the second-level against system area from three level of against system areas is the goal.
2007、2008 and 2009 year air quality fraction defective target value respectively is 6.2%, 5.7%, 5.1%,2008 year air quality fraction defective statistics to December is 2.19%, compare good old times. and falls in the target value, counts stops to 2008 year at the end of December, at present the area of jurisdiction air pollutant is apart from 2009 year besides SO2 the air quality goal differences to be far, other pollutant like O3, NO2 and PM10 close have conformed to 2009 year quality goal, demonstrated that in the future air of quality the Jiayi should continue to strengthen the improvement, and aims at the pollutant SO2 part to strengthen draws up the countermeasure control, achieves decides the air quality control goal.
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 sourc.