Taipei April 18 (CNA) Air quality was good for the most part in Taiwan Tuesday, with regions from Hsinchu in the north down to Pingtung in the south and Taitung in southeastern Taiwan all flashing green, indicating low levels of pollution, according to the Environmental Protection Administration's Taiwan Air Quality Monitoring Network.
As of 10 a.m., air quality in the Taipei region, neighboring Taoyuan City, Yilan County, Hualien in eastern Taiwan and the Kinmen and Matsu Islands to the west was moderate (yellow), according to the network (http://taqm.epa.gov.tw/taqm/en/).
For Wednesday, eastern Taiwan's Hualien and Taitung counties are expected to enjoy good air quality while in central Taiwan, the air quality will be unhealthy for sensitive groups such as young children, the elderly and people with a chronic disease.
For the rest of the country, the air quality is expected to be moderate, according to the network.
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.