The Air Pollution Index in Hong Kong reached 144 over the weekend, thereport said, crossing the critical 100 mark — the point at which those with respiratory or heart problems are urged to stay home.
The poor air quality was recorded even though many factories in the neighbouring Pearl River Delta in mainland China were closed for a week-long holiday.
More than a dozen Hong Kong pensioners were hospitalised on Saturday alone for breathing ailments, the report said.
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