嘉南地區細懸浮微粒濃度與氣象因子相關性分析：2006-2014

Abstract

Objectives: This article explors corrections between the fine particulate matter (PM_(2.5)) level and meteorological variables in the Chia-Nan area of Taiwan. Methods: Data regarding PM_(2.5) and meteorological variables (i.e., temperature, relative humidity, rainfall, and wind speed) between 2006 and 2014 were obtained from Environmental Protection Administration monitoring stations. The region studied is located in 4 southwestern districts (Chiayi City, Chiayi County, Tainan City, and Tainan County) and includes 3 ambient air quality-monitoring stations in Chiayi (Chiayi, Xingan, and Puzi stations) and 4 stations in Tainan (Xinying, Shanhua, Annan, and Tainan stations). Quartiles (25%, 50%, and 75%) and mean, minimum, and maximum levels were used to describe the characteristics of PM_(2.5) and meteorological variables, respectively. The relationship between PM_(2.5) and meteorological variables was estimated using the Pearson product correlation. Results: During the study period, the overall mean daily average level of PM_(2.5), temperature, relative humidity, cumulative level of rainfall, and wind speed were 38 μg/m^3, 24°C, 75%, 12.1 mm, and 2.3 m/s, respectively. In the Chia-Nan area of Taiwan, PM_(2.5) was negatively correlated with temperature (r = -0.446), relative humidity (r = -0.327), cumulative rainfall (r = -0.279), and wind speed (r = -0.173). During the Northeast Monsoon period, the absolute value of the correlation between wind speed and PM_(2.5) level was the largest (r = -0.371). However, during the Non–Northeast Monsoon period, the absolute value of the correlation between temperature and PM_(2.5) concentrations was the largest (r = -0.525). Conclusions: Wind speed and temperature have higher correlations with PM_(2.5) levels than do relative humidity and cumulative rainfall in the Chia- Nan area of Taiwan.