(一) Environmental load and trend
Since 1999, the city population over the years until 2010, the average annual growth rate of 2.76%, showing a trend of slow growth, population is 272,422 people, a population density of 4,538 persons per square kilometer, the province ranked No. 4. The city in 2010 a total of 286,939 vehicles, vehicle registration, vehicle density part of the area to 3,385 vehicles per square kilometer motorcycle highest 8 times in Taiwan, ranked No. 4 in the density of vehicles, all types of vehicles from 1999 to 2010 the total number of growth Trends, changes in rate of 26%. Growth rate of 2010 vehicles decreased 1.26% compared with 2009 cases.
(二) Air Quality Status
Statistics Southwest Region from 1994 to 2010 air quality monitoring data, indicators of pollutants in the area of suspended particles (PM10) and ozone (O3) occurs PSI> 100 in proportion to the suspended particles 39% 61% higher than the ozone. As of December 2010 PSI> 100 2.98% , Improvement over previous years (4.66%), and Conform to the current Southwest Area air quality improvement targets (3.59%). Chiayi City in 2010 at this stage PSI> 100 3.02%, The major impact of offshore sand storms, dust storms if the net impact of the number of days during the year PSI> 100 days (5 days), PSI> 100 1.37%, with significantly improved.
(三) EPA performance appraisal self-assessment
Consideration in 2010 to strengthen local control of performance characteristics (mobile sources), stationary sources will be adjusted to control weight (8%), increased weight of mobile sources of air pollution (18%), the same emission sources of air pollution, mobile sources to highlight the city Control performance. Since 2010 a total score of 86.61 points assessment, self-assessment score of 86%, suggested that future pollution load is still high for the city area, the project evaluation and quantitative targets for the year reached a low rate of projects (such as the promotion of less polluting vehicles, old vehicles Out of a few, etc.), of that, develop strategies to improve city air quality and for evaluation of success.
(四) Attainment of air quality objectives
Air Pollution Index (PSI) to improve the monthly average, the 2010 target is 67 (no units), statistical average of 2010 PSI and 64 months (no units), had reached 100%, values higher than 2009, 66 (no units ) are similar, a slight improvement.
Air Pollution Index (PSI) ratio greater than 100 improvements, at the end of December 2010 ended, PSI> 100 3.02%, PSI> 100 days (11 days, particulate at 10 stations and ozone at 1 station), representing 2010 pollution control goals 3.29% (12 Days) is better, and reached 100%.
