Analysis on Environmental Effect for Different Greening Pattern on Expressway

Through analysis on content of SO2, NO2 and CO2 in the air, the effect of different greening ways on the expressway on the air purifying was approached. The test results indicated that the effect of greening belts on SO2 was good, meanwhile the other greening patterns for SO2 and NO2 also were effective, while influence for CO2 content was slight.