SINGAPORE, Oct. 7 (Xinhua) — The air quality in Singapore deteriorated into the unhealthy range on Saturday morning as the change in wind direction brought haze to the city state.
The 24-hour Pollutant Standards Index (PSI) readings ranged between 61 and 107 this morning, with the highest reading recorded in the eastern part of the island, according to Singapore’s National Environment Agency (NEA).
A PSI