Reuters: Hong Kong’s harbor was cloaked in thick smog on Monday as air pollution soared to record levels ahead of the Hong Kong Sevens rugby tournament this weekend, the city’s premier sporting event. Taiwan, too, was hit by what are being called the worst sandstorms in 25 years, though particulate levels had declined on Monday and there were no findings of airborne toxins. Sandstorms from northern China were mostly blamed, with a second dust storm hitting Beijing on Monday, though …