Water and air quality in Hong Kong have not been affected by the firing of tear gas at protests that have plagued the city for nearly five months, a government minister has said amid growing concern over its health impact.Secretary for Food and Health Sophia Chan Siu-chee sought to allay fears after local medical professors warned in The Lancet that deployment of tear gas in subtropical environments such as Hong Kong could expose people to high concentrations of chemical irritants over a…
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