Numerous policy measures have been put in place to try to improve Hong Kong’s roadside air quality. Official estimates are that these measures have significantly lowered overall emissions. Yet air quality at the roadside, where it is most perceptible and harmful to health, has not improved commensurably. This paper discusses the differences between the patterns of official emissions and concentrations measured at the roadside; and suggests accurate emissions estimates to feed into policy assessments and hence policy formulation to provide urgently needed improvements in street level air quality.
3 August 2011 – SCMP – Curious contradiction between the model and the reality