Chan Chang-Chuan, Hwang Jing-Shiang
a National Taiwan University, College of Public Health, Institute of Occupational Medicine and Industrial , Hygiene , Taipei , Taiwan.
b Institute of Statistical Science, Academia Sinica , Taipei , Taiwan.
J Air Waste Manag Assoc. 1996 Aug;46(8):755-760. doi: 10.1080/10473289.1996.10467510.
This paper describes a statistic to quantify spatial representativeness for the air measurements of an urban fixed-site ambient air monitoring station. The application of such a statistic of representativeness has also been successfully demonstrated by two data sets collected at the Gu-Ting monitoring station in Taipei. By measuring NO2 at 22 sites simultaneously around the Gu-Ting station, the statistic has characterized different degrees of spatial representativeness for nitrogen dioxide (NO2) at various areas and microenvironments surrounding this fixed-site monitoring station. By measuring ambient air concentrations at six sites sequentially around the Gu-Ting station, the statistic has also characterized different degrees of representativeness for particulates less than 10 urn in size-(PM10), carbon monoxide (CO), sulfur dioxide (SO2), ozone (O3), NO2, nitrogen oxides (NOX), nitrogen monoxide (NO), total hydrocarbons (THC), and nonmethane hydrocarbons (NMHQ-at an open area surrounding this fixed-site monitoring station. This statistical method identifies the Gu-Ting station is well representative of outdoor concentrations of all nine air pollutants for a period of three weeks at the areas within a 700 m radius around this station. The indoor NO2 concentrations, however, are not represented by the measurements at the fixed-site monitoring station.
本文描述了一种用于量化城市固定站点环境空气监测站空气测量空间代表性的统计方法。台北古亭监测站收集的两组数据集也成功证明了这种代表性统计方法的应用。通过在古亭站周围22个地点同时测量二氧化氮，该统计方法表征了该固定站点监测站周围不同区域和微环境中二氧化氮（NO₂）的不同程度的空间代表性。通过在古亭站周围六个地点依次测量环境空气浓度，该统计方法还表征了该固定站点监测站周围开阔区域中粒径小于10微米的颗粒物（PM₁₀）、一氧化碳（CO）、二氧化硫（SO₂）、臭氧（O₃）、二氧化氮（NO₂）、氮氧化物（NOₓ）、一氧化氮（NO）、总烃（THC）和非甲烷烃（NMHC）的不同程度的代表性。这种统计方法表明，在该站周围半径700米范围内的区域，古亭站在三周时间内能够很好地代表所有九种空气污染物的室外浓度。然而，固定站点监测站的测量结果并不能代表室内二氧化氮浓度。
