Summary of the work during the year are as follows:
(A) Environmental loads and trends
Since 1999 till 2011, the average growth rate of the city's population is chronologically 2.5%, showing slow growth. These two years, the population has shown negative growth. The population in 2011 is 271,644 people. Compared with 2010, it has decreased by 0.27%; the population density is 4,525 people per square kilometer, ranked No. 2, only next to Taipei (9724 people per square kilometer). In the city, there is a total of 290,280 registered vehicles. In the past decade, the trend for the vehicle changes is growing. The growth rate is 22%. It still grew 1.5%, compared with that 1999. The highest density load lies in scooters (3,432 vehicles per square kilometer), which is eight times for that in Taiwan. Vehicle density in this city ranked No.2 in the country (Taipei，6,778 vehicles per square kilometer).
Construction engineering and factories showed showed a negative growth trend; the rate of change are -38%, and -13% respectively.
(B) Air quality condition
Chiayi City area belongs to Southwest Air Quality Zone. In the past decade, for the air quality proportion in a day, suspended particles are 54%, higher than ozone, 46%.
The poor air rate in this Air quality zone this year was 1.47%, in line with the target, which is less than 2.9%; and poor air quality rate in the city was 2.19% (8 station day), in line with this year's goal, which is less than 2.74% control (10 station day). The target pollutants of the air quality in the city are mainly the suspended particles.
(C) Reporting procedures of the poor air quality
This year 2010 Poor Air Quality Reporting Procedures in Chiayi City have been reviewed and revised. The revised content has been reviewed according to the amended conditions and the amended plan and pollutants have been updated. By Statistics this year, there is a total of 45 poor air quality reports (including forecasting 30) in which the majority are suspended particles, accounting for 29 times, a proportion of 64%, among which the poor air quality station day is for 5 station day. The target pollutants are all suspended particles, after the notification of which PSI values have increased by 7 times in total, with 38-time improved results (PSI ratio<100).
In the Southwest (Yunlin, Chiayi and Tainan) air quality zone, all the cities, on Sept. 2, had a joint implementation of air quality deterioration drill. Chiayi city practiced the drill exercises according to the amended procedures on Sept. 9th and also investigated stationary pollution sources, construction engineering respectively to confirm the effectiveness of pollution control in every plant.
(D) Air purification zone
In this year, two assessment operations have been completed, respectively on March 28 and Sept. 30. After the on-site assessment, "The under-way first section of bike way(Chia Oil Bike way” is the best, followed by "old Guanghua camp exposed land greenization and landscaping engineering project."
Department of Environmental Protection, Executive Yuan held a contest for fine air quality purification zone and "The under-way first section of bike way (Chia oil Bikeway)" won the efficiency contribution award in the Nation-wide fine air quality purification zone contest.
(E) Self-management of indoor air quality
Indoor air quality self-management was promoted. In this year, 20 places responded to the promotion implementation, accounting for 100%. There is a total of 60 places responding to the management policy. Through the monthly inspection operation, we have helped administrators in four public places to emphasis on the indoor air quality, and have increased ventilation and improved the poor situation in the past. Among them, Chiayi hospital, Department of Health, Executive Yuan had the most change. The inspection concentrations are from 936ppm down to 542ppm. In addition, Yang Xinhao from Daojiang High School of Commerce have been hired for guidance on indoor air quality, helping 10 places to understand the problem and providing improved methods.
