Question

a) Why is the Screen3 air quality model needed?

b) What kind of information about air quality can be obtained by using Screen3 model?

c) What are the differences between Gauss dispersion model and screen3 model?

d) What can the screen3 model do without the Gauss model?

Answer 1

Ans a : These Screen3 air quality models are used or utilized for the estimation of ground level concentration for single source and also for the concentartion in the cavity zones as well which can be of worst case scenario .

Ans b : In Screen3 model it refers to as a single source Gaussian model which is used to provide maximum ground level concentrations for various point, area, and volume subjects, and also a concentrations in the cavity zone, and in the concentration which is due to the inversion breakup .

Ans c : Screen3 model is an EPA model whereas gauss model is an regulaotry dipersion model , It is very easy to use and can be applied to worst cases whereas gauss model requires detailed data . No additional modelling is required for screen3 model whereas additional modelling is required for Gauss model .

Ans d : It will only indicates the air quality impacts which would exceeds the regulatory standards so as to be a bit more accurate with the air concentration estimates it requires detailed data which is given by Gauss model .

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