18 groups have petitioned the Health Department to create a Housing Advisory Committee to work toward improvement of regulations they say are now "bare minimum standards."
The US National Centre for Atmospheric Research has found that carbon monoxide levels have spiked due to billowing smoke from wildfires in the last few years.
Carbon monoxide and nitrogen oxide pollution have fallen sharply in Hong Kong since it introduced a world-first scheme to detect and repair vehicles with the highest emissions.
