Taipei, March 17 (CNA) The air quality was poor in most parts of central and southern Taiwan on Sunday, meaning it was unhealthy for sensitive groups or even the general public there, according to the Environmental Protection Administration's (EPA's) Taiwan Air Quality Monitoring Network.
As of 11 a.m., a red light flash for most parts of Nantou County in central Taiwan as well as in Yunlin, Chiayi, Tainan, and Kaohsiung counties in southern Taiwan, indicating air quality there was unhealthy for the general public.
At the same time, a green light flashed for the north and neighboring Hsinchu and Miaoli counties, as well as for Yilan, Hualien and Taitung counties in eastern Taiwan, indicating that the air quality in those regions was good, according to the network (http://taqm.epa.gov.tw/taqm/en/).
Offshore islands of Matsu and Kinmen had moderate air quality (yellow), while Penghu Island had good air quality (green).
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 a pollutant reading of less than 50; yellow indicates "moderate" at 50-100; orange means "unhealthy for sensitive groups" with a reading of 101-150; red indicates "unhealthy" with a range of 151-200; purple signifies "very unhealthy" with a level of 201-300; maroon represents "hazardous" with a reading of 301-500.
(By Flor Wang)