Taipei April 21 (CNA) Air quality was moderate to good all around Taiwan Friday, including many parts of western Taiwan normally prone to air pollution, according to the Environmental Protection Administration's Taiwan Air Quality Monitoring Network.
As of 11 a.m., most parts of Taoyuan, Hsinchu, Miaoli, Taichung, Nantou, Changhua, down to Chiayi, Tainan, Kaohsiung and Pingtung were seeing good air quality whereas in the Taipei region and Changhua, more monitoring stations were showing yellow, indicating moderate air quality, than green (good air quality), according to the network (http://taqm.epa.gov.tw/taqm/en/).
In eastern Taiwan's Hualien and Taitung Counties and the offshore counties of Kinmen and Matsu, air quality was moderate.
For Saturday, central Taiwan and cities and counties to the south in western Taiwan could experience air quality that is unhealthy for sensitive groups, such as young children, the elderly and people with a chronic disease.
The rest of the country is expected to see moderate air quality.
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 50-100; 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.