Kim B M, Teffera S, Zeldin M D
South Coast Air Quality Management District, Planning and Policy, Diamond Bar, California, USA.
J Air Waste Manag Assoc. 2000 Dec;50(12):2045-59.
The South Coast Air Quality Management District (SCAQMD) conducted a 1-year special particulate monitoring study from January 1995 to February 1996. This monitoring data indicates that high PM10 and PM2.5 concentrations were observed in the fall (October, November, and December), with November concentrations being the highest. During the rest of the year, PM2.5 and PM10 masses gradually increased from January to September. Monthly PM10 mass varied from 20 to 120 micrograms/m3, and monthly PM2.5 mass varied from 13 to 63 micrograms/m3. The PM2.5-to-PM10 ratio varied daily and ranged between 22 and 96%. Two types of high-PM days were observed. The first type was observed under fall stagnation conditions, which lead to high secondary species concentrations. The second type was observed under high wind conditions, which lead to high primary coarse particles of crustal components. The highest 24-hr average PM10 concentration (226.3 micrograms/m3) was observed at the Fontana station, while the highest PM2.5 concentration (129.3 micrograms/m3) was observed at the Diamond Bar station.
南海岸空气质量管理区（SCAQMD）于1995年1月至1996年2月进行了为期1年的特殊颗粒物监测研究。该监测数据表明，秋季（10月、11月和12月）观测到较高的PM10和PM2.5浓度，其中11月的浓度最高。在一年中的其他时间里，PM2.5和PM10质量从1月到9月逐渐增加。每月PM10质量在20至120微克/立方米之间变化，每月PM2.5质量在13至63微克/立方米之间变化。PM2.5与PM10的比例每天都有所不同，范围在22%至96%之间。观测到两种高颗粒物浓度日。第一种出现在秋季停滞条件下，导致二次物种浓度升高。第二种出现在大风条件下，导致地壳成分的一次粗颗粒浓度升高。丰塔纳站观测到的24小时平均PM10最高浓度为（226.3微克/立方米），而钻石吧站观测到的PM2.5最高浓度为（129.3微克/立方米）。
