Taipei--The air quality in Taiwan was poor in central and southern Taiwan and good and fair in northern and eastern parts of the island Wednesday, according to the Environmental Protection Administration's Taiwan Air Quality Monitoring Network.
As of 11 a.m., air quality in Changhua, Yunlin and Chiayi, as well as the outlying island of Kinmen, flashed red, meaning unhealthy air for everybody, the network data showed.
Some monitoring stations in southern Taiwan's Tainan and Kaohsiung also showed red, with other stations in the region flashing orange, signaling unhealthy air for young children, the elderly and people with chronic diseases, or yellow, meaning fair air quality.
In western Taiwan, only two stations flashed green, meaning good air quality, and they were in Chialu and Hengchun in the southernmost county of Pingtung, it said.
Many of the stations with a red light also showed high levels of PM2.5 and PM10 particulates, the data showed.
In most parts of northern Taiwan, the air quality index flashed orange or yellow, while the air quality in eastern Taiwan's Yilan, Hualien and Taitung was good to fair, network data showed.
For Thursday, the air quality is expected to flash orange in central and southern Taiwan, yellow in northern Taiwan and green in eastern Taiwan.
The EPA's six-color scale takes into account ozone, PM2.5 and PM10 particulates, carbon monoxide, sulfur dioxide and nitric oxide concentrations in the air.
Green represents good air quality with an index reading of 0-50; yellow indicates moderate with a reading of 51-100; orange means unhealthy air quality for sensitive groups with a reading of 101-150; red indicates unhealthy quality with a range of 151-200; purple signifies very unhealthy levels at 201-300; and maroon represents hazardous levels at a reading of 301-500.
Source: Focus Taiwan News Channel