This project is to evaluate the total pollutant uptake amount for six common tree species in Taiwan’s Environmental parks. The target pollutants include NO2, O3, HCl, and particulates. Totally there are ten study items for this project. They are (1) literature review for total pollutant uptake amount for six common tree species, including Bischofia javanica, Cinnamomum camphora, Zelkova serrata, Fraxinus formosana, Michelia compressa ,and Pterocarpus indicus. (2) establishing the measuring technology for adult trees. (3) measuring the total NO2 and ozone uptake amount for different ages of trees. (4) measuring the total NO2 and ozone uptake amount at different time periods in a day. (5) measuring the total NO2 and ozone uptake amount at different seasons. (6) measuring the total NO2 and ozone uptake amount under different light intensity. (7) measuring the total NO2 and ozone uptake amount under different humidity conditions. (8) measuring the total HCl uptake amount for six common tree species. (9) measuring the total particulate uptake amount for six common tree species. And (10) yearly evaluation of total pollutant uptake amount for six common tree species. Results showed that the pollutant uptake rates were different for different ages, different time periods in a day, different seasons, different light intensity, and different leaf wetness. The four-day dust deposition rate measured in non-rainy days was found to be ideal for estimating the yearly deposition rate of dust. Generally the big trees for a hectares can uptake 15~54 kg of NO2, 12~42 kg of O3, estimated 2~16 kg of HCl, 2~21 tons of dust, approximately 15 tons of CO2, and emit about 10 ton of oxygen. These data would be useful for Taiwan EPA and other organizations to select the good trees for planting in polluted areas in Taiwan.

Air-cleaning,Pollutant,uptake,Ozone,Nitrogen,dioxide