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Taiwan Air Quality
In the spring, the retention front and the south China cloud belt move eastward in Taiwan. If the retention front wanders in Taiwan and resulting in continuous precipitation, the air is quite good. If the retention front wandering near the East China Sea makes the pressure gradient weak, resulting in small wind-speed and warm in Taiwan, and the air quality will be poor. During the summer and early autumn, Taiwan is mainly affected by the Pacific subtropical high and the southwest monsoon. The high wind-speed in the southern region of Taiwan due to the southwest monsoon, convective strong in afternoon. At the time, the air quality is generally better. The air quality is poor in north and northeast regions because of terrain blocking effect. As for the impact of the Pacific subtropical high, its descending air accompanied is more stable and the humidity is small, that all parts of the country are not conducive to the proliferation of pollutants, the degree of influence depends on the lacations of the intensity of the vice pressure and high pressure ridge. In addition, it is often affected by typhoons in this season, when the typhoon invasion, the wind-speed significantly enhances and the air quality gets better; if the typhoon is not directly landing, only by typhoon circulation, the air quality around Taiwan depends on the position of typhoon, in which the ozone concentration changes quite large at this time.
(Soruce:Taiwan Air Quality Monitoring Network)

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Air Quality Monitoring
The mainly mission of Air quality monitoring is managing air quality monitoring data, environmental air dioxin monitoring data and air quality manual inspection data of county and city environmental protection bureaus for users to check the air quality monitoring results according to air quality monitoring stations. The central competent authority shall define the control zones by the land use at the municipal, county (or city) levels for air quality requirements or air quality conditions and announce them. Control is divided into the following three levels: a control zone refers to the national parks and nature conservation (nurture) and other areas designated by law. Secondary control zone means except the first control zone, in line with the air quality standard area. Third-level control zone refers to a control zone where the air quality does not meet the standard area.
(Soruce:Laws and Regulations retrieve system)
Pollutant Standards Index
Air pollutants mainly include sulfur oxides, nitrogen oxides and hydrocarbons and other gaseous pollutants; suspended particles, metal fumes and soot and other particulate pollutants; photochemical fog and ozone and other derived pollutants; dioxin and Hydrogen cyanide and other toxic pollutants; odor pollutants, organic solvents, such as steam, plastic and rubber . Pollutant Standards Index(PSI) is the maximum value of the air pollutant sub-indicator value of the pollutant of the day, which calculated from the measured values of PM10 (not including suspended particulates with the particle size 10 microns or more than 10 microns), sulfur dioxide, nitrogen dioxide, carbon monoxide and ozone concentration in the air. If the PSI is less than 100, it means that the air quality of the station meets the short-term (24 hours or more) in the US ambient air quality standard. If the PSI is greater than 100, the health will be adversely affected.
(Soruce:Web of air quality monitoring)
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