(added on 2014/03/19)
Air Monitoring for Our Health 為吸一口健康空氣
The Environmental Protection Department in Hong Kong has set up a number of air quality monitoring stations. Since the end of 2013, a new indicator, Air Quality Health Index (AQHI), has been launched for reporting local air quality. The map shows the distribution of 12 general monitoring stations and 3 roadside monitoring stations in Hong Kong, indicated by green dots and brown squares respectively. Except for the station in Tap Mun, AQHI from each general monitoring station represents the air quality of its own district as well as other district(s) shaded in the same colours. Air quality of Southern District is represented by AQHI from either station in Central/Western or Eastern District.
The line graphs below the map show the variation of AQHI in the third week of February, 2014. Regular fluctuation of AQHIs among roadside stations is observed, probably due to daily change in traffic flow. Rapid rise in AQHI was detected in general stations on 18 February when a cold front arrived with prevailing northwest wind. The observation that AQHIs from the stations located in the western part of Hong Kong increased first might be explained by the regional air pollution in Pearl River Delta.
Data for the map were obtained from Environmental Protection Department, Hong Kong Government.
環境保護署已於本港多處設置空氣質素監測站，並於2013底開始以新的空氣質素健康指數為指標，告知市民各區的空氣質素實況。地圖顯示本港共 12 個一般監測站（以綠色圓點顯示）及 3 個路邊監測站（以啡色方塊顯示）的分佈位置。除塔門監測站外，其餘的一般監測站的空氣質素健康指數均代表所在地區的空氣質素，部分監測站所得的指數亦能代表鄰近已塗上相同顏色的地區之空氣質素。南區的空氣質素則以中西區或東區的監測站所錄得的指數代表。
地圖下方的折線圖顯示了 2014 年 2 月份第 3 週的空氣質素健康指數的變化。路邊監測站的指數有規律的升跌，顯示出每日交通流量的轉變對路邊空氣的影響。另外，各個一般監測站的空氣質素健康指數於2月18日均曾錄得顯著的升幅。當日下午冷峰到港，盛行風為西北風，珠三角地區的污染物或因此被吹到香港，令本港西面的監測站的空氣質素健康指數率先上升。