Norman's Words

At the end of March 2010, I visited the Lai Chi Chong Geo Trail which is one of the famous geology sites in Hong Kong. Diversified Sedimentary Rocks are found in this 500 m trail. Amongst them are tuffite ,tuffaceous sandstone, siltstone, coarse ash crystal tuff, eutaxitic fine ash tuff, porphyritic rhyolite and rust-coloured conglomerate and siltstone.

On 22 March, Air Pollution Index reached a record high of 500 since 1995. According to Environmental Protection Department, the high levels of Respirable Suspended Particulates, the contributing pollutant, were partly caused by a sandstorm in northern China, which has been moving south. It seems that a pre-alert system is necessary to warn the Hong Kong residents in advance of any sandstorm attack in the future.