Taiwan's first bout of haze arrived on Oct. 23 when northern Taiwan recorded a high concentration of PM2.5. The air quality is expected to improve on Oct. 24.
The Environmental Protection Administration's air quality monitoring platform shows an "orange" alert flashing in northern Taiwan, which means the air is unhealthy for sensitive groups. Taiwan saw its first bout of haze since the start of fall on Oct. 23. A monitoring station in Cape Fukuei recorded a PM 2.5 concentration of 50 micrograms per cubic meter at 4 to 5 a.m. Shortly after, a sand and dust storm from China's Inner Mongolia arrived, and the PM 10 concentration peaked at 7 a.m. Luckily, the storm had a long way to travel and there was rain, so the pollution was not bad. The air quality is expected to return to normal across Taiwan on Oct. 24.
It happened to rain in the north, which reduced the overall impact. It's expected to affect the central and southern regions during the entirety of Oct. 23, and the air quality will progressively begin returning to normal tomorrow.
Oct. 23 was "Frost Descends," the 18th of the 24 solar terms. Temperatures fell across Taiwan due to the influence of the northeast monsoon. The lowest temperature recorded as of 11 a.m. was 16.1 degrees Celsius in Miaoli County's Tongluo Township. The Central Weather Bureau forecasts low temperatures early in the morning on Oct. 25 and reminds the public to stay warm.
The minimum temperature in the northern region and Yilan region is expected to be 18 to 19 degrees, and it will feel cool. The central and southern region and the Hualien-Taitung region will see a minimum temperature of around 20 degrees.
The precipitation in northern Taiwan shows signs of slacking. The CWB says it will gradually begin getting drier in the north on the evening of Oct. 23, while the central and southern regions will see sporadic rain due to the effects of a typhoon's periphery cloud system. The northeast monsoon will begin weakening starting on Oct. 25 and won't strengthen until three to four days later.