With northerlies/northeasterlies persisting, and no rain for what seems ages, foul air pollution seems never ending at present; and – of course! – Edward Yau hasn’t made any utterances on the issue. Checking Env Protection Dept site, can see that air pollution is "High" at all stations (well, very high at two), with respirable suspended particulates the main contributor. Reflecting fact this is a regional issue, even at Tap Mun out in Tolo Harbour, the API is horribly high. Here’s latest chart – showing pollution level stuck at nigh on 100. 
Wild About Hong Kong - hiking, wildlife, conservation and more
Wild About Hong Kong - hiking, wildlife, conservation and more