Protesters extinguish tear gas canisters during clashes with riot police outside Polytechnic University, in Hung Hom on November 17. Photo: Winson Wong

Letters | Hong Kong protests, police and tear gas: time to clear the air on toxic facts

  • Government environment officials routinely collect samples to assess air quality. They must now do so in areas affected by tear gas and report on their findings
  • If not, green groups have an ethical duty to perform this urgent public service
Topic |   Hong Kong protests
Protesters extinguish tear gas canisters during clashes with riot police outside Polytechnic University, in Hung Hom on November 17. Photo: Winson Wong
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