BLOG: GOVT'S FOCUS ON MONITORING GENERAL, INSTEAD OF ROADSIDE, AIR QUALITY SHOWS THAT PRIORITIES ARE UPSIDE DOWN

In the wake of the news that Hong Kong's roadside pollution reached life-threatening levels in 2009, http://www.google.com/hostednews/afp/article/ALeqM5gE0Vya-Hwgdo2D2YLPT0skOGy1Gg, DAB LegCo member Chan Hak-kan rightly posed the question to the EPD, will the EPD consider installing more roadside monitors? No, was the answer from Kitty Poon Kit, the EPD's spokesperson. Apparently, the Government feels that the current monitoring network is sufficient.

But a quick analysis of results derived from HKUST's recent mobile air pollution monitoring study shows that the roadside pollution in Wanchai was actually the worst in HK, even though the Government monitoring stations are located in only Central, Causeway Bay and Mongkok. The Government's justification for not needing additional monitors is that these three monitors are sufficiently accurate proxies for roadside monitoring at other highly trafficked locations all over Hong Kong. The case of Wanchai obviously challenges the prudence of this assumption. Furthermore, the HKUST study showed big variations between different streets in the same district and between different districts.

http://hongkongcan.org/eng/wp-content/uploads/2009/08/Mapresult.pdf

What's more disturbing, however, in the big picture, is the fact that the Government's monitoring network -- 11 of 14 stations measuring ambient air quality, rather than roadside emissions -- is predicated on their outdated concern about overall pollutant tonnage, rather than adverse impacts to human health. OBVIOUSLY, it's the spumes of diesel particles blowing in a person's face, on the street, which affect human health the most. One ton of PM emitted by a coal-fired power plant 30 meters above ground is obviously going to be a lot less damaging to human beings than the same weight of emissions beging emitted at street level.

The mentality which dominated 20 years ago is no longer relevant or useful to the public health crisis we are confronting today. If a resident of Hong Kong needs to know the pollution reading on any given day, it is the ROADSIDE reading which is highly relevant and useful -- NOT an ambient reading! In the same vein, Government should be formulating air quality management policy based on COMPREHENSIVE readings of ROADSIDE pollution throughout Hong Kong. When it comes to human health, these are the MAIN readings which count. And, lest anyone have failed to read the newspaper recently, roadside pollution is, at best, the same, if not deteriorating.

(For the sake of argument, let's assume the 3 roadside monitors ARE a decent proxy for all of HK's roadside pollution, the fact that there are only 3 compared to 11 general monitors STILL points to the outmoded policy and mentality which led to the building of such a network in the first place. Unfortunately, the mentality which led to the building of the monitoring network is the same one proposing public policy today.)

Thus, the locations of the official monitors should actually be inverted if the Government wants to live up to its stated intention of protecting public health.
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