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DEGREE OF PROTECTION OF PEDESTRIAN ULTRAVIOLET LEVEL BY USING TREE CANOPIES

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Abstract (2. Language): 
Absorption of too much UV exposure leads to skin cancer. Pedestrian UV level depend on several factors such as temperature, humidity, cloud, aerosol, insolation and human behavior. Though sunscreen products that contain avobenzone, ecamsule, zinc oxide, titanium dioxide can provide some protection from UVB and most UVA rays but trees can also prevent UV exposure by providing obstruction to direct sun rays. A case study is conducted to quantify the exposure level and degree of protection using tree canopies within Kalyani University campus in the district of Nadia, West Bengal where average human load at peak hours from 10:00hrs to 14:00 hrs is around 1800. Among the fourteen tree species studied so far at Kalyani (22.58°N, 88.26°E) 68 km away from Tropic of Cancer (23½º), Radhachura (Peltophorum pterocarpum) is found to give best obstruction to pedestrians. Moreover the exposure level also depends on tree cover. Depending on the tree species the shade ratio varies from 0.012 to 0.317.
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