| 英文摘要 |
The goals of this study are (1) to maintain acid deposition network for conducting a long-term monitoring and data analysis, (2) to maintain the integrated atmospheric mercury monitoring network and analyze the data, (3) to establish and maintain an integrated atmospheric modeling system for studying the long-range transport of air pollutants and local air pollutants in order to assess their impact to Taiwan air quality, and further to provide fundamental information to EPA for air pollution management, (4) to recalculate the AQI index when extreme air pollution events occur in order to highlight the contribution from local air pollutants and provide a reference for the EPA, (5) to investigate the impact of acid rain and fog acidity to the ecosystem’s nutrient cycling, (6) to update and maintain the web site of Taiwan’s acid rain, (7) to promote international cooperation and technical exchanges on regional air pollutant transport issues. To date, our achievements are highlighted below:
a.1200 samples were collected from 14 acid deposition stations all over Taiwan in 2020. The average pH for all the samples was 5.60. The acid rain situation in Taiwan has slightly improved. The annual average pH values for most of the sites are greater than 5.0. Annual average pH values at Northern Taiwan sites are still lower than in southern Taiwan.
b.445 samples were collected from 12 mercury wet deposition stations all over Taiwan in 2020. The total mercury concentration from each station was between 2.3– 68.0 ng L-1. The weighted mean mercury concentration was between 7.5 – 24.1 ng L-1, with the lowest at Anbu and Yilan station and the highest at Kaoshiung station. This range of mercury concentration in Taiwan is now lower than the vast majority of countries worldwide.
c.The web site (https://acidrain.epa.gov.tw/) for Taiwan’s acid rain studies has been updated with more information.
d.We have continued to promote and participated in international collaborations and technical exchanges, for example with Quality Assurance Science Activity Center of UN, and the World Meteorological Organization Global Precipitation Chemistry and Deposition Science Assessment.
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