The average concentrations of PM 2.5 and PM 10 stood at 190 and 153, respectively.
The maximum temperature during the day is likely to hover around 32 degrees Celsius, and a partly cloudy sky has been forecast.
The maximum temperature on Tuesday is likely to hover around 30 degrees Celsius, and a partly cloudy sky has been forecast.
Chanthu was 580 kilometers (360 miles) southeast of Taiwan and northeast of the Philippines, the Central Weather Bureau said.