https://saikungbuzz.hk/2018/07/10/ts...-gas-chambers/
One member described the air quality for those waiting for buses as “like living in “large-scale gas chambers.”...all interchanges exceeded the WHO guidelines for PM2.5, some over 5x the maximum recommended 10 µgm/m³. South Horizons at “51”, is the highest among the six interchanges tested, followed by Lam Tin interchange, where the PM2.5 concentration is “50.”