Health hazard of using gas-cookers - 狮城黄师傅排便妙招 ：
So far as we know that gas mixing with air would cause explosion when sparks or ignition occur. Gas-lacking from a gas cooker is not easily to be detected because gas usually has little or no smell. Therefore for safety sake some city-gases are deliberately made smelly ! Old gas valve or old rubber gas…
hkwong
