PRELIMINARY EXPLANATION OF THIS PAST WEEK’S UNPRECEDENTED POLLUTION IN HONG KONG
COPY & PASTE FROM HKUST’S PROFESSOR ALEXIS LAU:
Up to about 4pm yesterday, the pollution was dominated by NO2 and was locally generated. I was asked by two newspapers yesterday whether the pollution was sandstorm related and I said, no, because the dominating pollutant was NO2.
However, the sandstorm came over HK at about 5pm with strengthing easterlies and we are now seeing the worst air pollution I’ve seen in HK. I will give a detailed analysis later today
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Why does the EPD stop all reports of air pollutant concentrations at 11 a.m. today? For Central Western there are no figures at all.
This is hiding monitoring data and is deplorable.