Heat Stress at Work Warning system is intended to alert outdoor manual workers and those indoors with limited ventilation to risks.

Pledge follows calls to adopt international measurement that places greater weight on direct sunlight and to increase monitoring stations.

Commissioner for Labour Sam Hui says thresholds could be adjusted after the heat-stress warning failed to rise during city’s hottest day on record.

The government needs to deliver on its pledge to address the shortfalls of the city’s heat stress warning system.

Parts of northern Hong Kong including Yuen Long and Ta Kwu Ling surpass 35 degrees before noon.

Heatwave has taken toll on indoor and outdoor workers, triggering calls for authorities to review heat stress prevention measures.

Heat Stress at Work Warning system is intended to alert outdoor manual workers and those indoors with limited ventilation to risks.

Observatory records temperatures between 23 and 29 degrees Celsius as of 8.45am on Friday, significantly lower than 33 degrees over past nine days.