An air pollutant is being released from the entire urban are

An air pollutant is being released from the entire urban area at a rate of 35 g/s. Assuming the urban area to be a rectangular area source 20 by 18 m dimension, with a source height and receptor height of 30 m and 5 m respectively, the maximum concentration at the receptor height and the distance to the maximum concentration are (use SCREEN) 5088ug/m3, 84m 6749ug/m3, 104m 8088pg/m3, 304m

Solution

****** SCREEN3 MODEL ******
**** VERSION DATED 95250 ****

ENTER TITLE FOR THIS RUN (UP TO 79 CHARACTERS):
RIDDLE

ENTER SOURCE TYPE: P FOR POINT
F FOR FLARE
A FOR AREA
V FOR VOLUME
A
ENTER EMISSION RATE (G/(S-M**2)):
0.0875
ENTER SOURCE RELEASE HEIGHT (M):
30
ENTER LENGTH OF LARGER SIDE FOR AREA (M):
20
ENTER LENGTH OF SMALLER SIDE FOR AREA (M):
20
ENTER RECEPTOR HEIGHT ABOVE GROUND (FOR FLAGPOLE RECEPTOR) (M):
5
ENTER URBAN/RURAL OPTION (U=URBAN, R=RURAL):
U
SEARCH THROUGH RANGE OF DIRECTIONS TO FIND THE MAXIMUM?
ENTER Y OR N:
Y
ENTER CHOICE OF METEOROLOGY;
1 - FULL METEOROLOGY (ALL STABILITIES & WIND SPEEDS)
2 - INPUT SINGLE STABILITY CLASS
3 - INPUT SINGLE STABILITY CLASS AND WIND SPEED
1
USE AUTOMATED DISTANCE ARRAY? ENTER Y OR N:
Y
ENTER MIN AND MAX DISTANCES TO USE (M):
10 10000

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*** SCREEN AUTOMATED DISTANCES ***
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*** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ***

DIST CONC U10M USTK MIX HT PLUME MAX DIR
(M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) (DEG)
------- ---------- ---- ----- ----- ------ ------ -------
10. .7485E-01 1 1.0 1.2 320.0 30.00 39.
100. 6700. 3 1.0 1.2 320.0 30.00 41.
200. 5421. 4 1.0 1.3 320.0 30.00 36.
300. 4239. 5 1.0 1.4 10000.0 30.00 40.
400. 3827. 5 1.0 1.4 10000.0 30.00 37.
500. 3206. 5 1.0 1.4 10000.0 30.00 1.
600. 2658. 5 1.0 1.4 10000.0 30.00 20.
700. 2226. 5 1.0 1.4 10000.0 30.00 28.
800. 1890. 5 1.0 1.4 10000.0 30.00 28.
900. 1628. 5 1.0 1.4 10000.0 30.00 10.
1000. 1420. 5 1.0 1.4 10000.0 30.00 5.
1100. 1254. 5 1.0 1.4 10000.0 30.00 1.
1200. 1117. 5 1.0 1.4 10000.0 30.00 5.
1300. 1004. 5 1.0 1.4 10000.0 30.00 7.
1400. 909.8 5 1.0 1.4 10000.0 30.00 11.
1500. 829.9 5 1.0 1.4 10000.0 30.00 7.
1600. 761.6 5 1.0 1.4 10000.0 30.00 11.
1700. 702.7 5 1.0 1.4 10000.0 30.00 7.
1800. 651.5 5 1.0 1.4 10000.0 30.00 7.
1900. 606.6 5 1.0 1.4 10000.0 30.00 17.
2000. 567.1 5 1.0 1.4 10000.0 30.00 7.
2100. 531.9 5 1.0 1.4 10000.0 30.00 11.
2200. 500.6 5 1.0 1.4 10000.0 30.00 19.
2300. 472.4 5 1.0 1.4 10000.0 30.00 19.
2400. 447.1 5 1.0 1.4 10000.0 30.00 7.
2500. 424.1 5 1.0 1.4 10000.0 30.00 7.
2600. 403.2 5 1.0 1.4 10000.0 30.00 11.
2700. 384.2 5 1.0 1.4 10000.0 30.00 19.
2800. 366.8 5 1.0 1.4 10000.0 30.00 19.
2900. 350.7 5 1.0 1.4 10000.0 30.00 7.
3000. 336.0 5 1.0 1.4 10000.0 30.00 11.
3500. 276.8 5 1.0 1.4 10000.0 30.00 11.
4000. 234.7 5 1.0 1.4 10000.0 30.00 25.
4500. 203.3 5 1.0 1.4 10000.0 30.00 25.
5000. 179.0 5 1.0 1.4 10000.0 30.00 30.
5500. 159.8 5 1.0 1.4 10000.0 30.00 30.
6000. 144.2 5 1.0 1.4 10000.0 30.00 25.
6500. 131.3 5 1.0 1.4 10000.0 30.00 30.
7000. 120.5 5 1.0 1.4 10000.0 30.00 10.
7500. 111.3 5 1.0 1.4 10000.0 30.00 25.
8000. 103.4 5 1.0 1.4 10000.0 30.00 13.
8500. 96.47 5 1.0 1.4 10000.0 30.00 13.
9000. 90.42 5 1.0 1.4 10000.0 30.00 13.
9500. 85.08 5 1.0 1.4 10000.0 30.00 13.
10000. 80.32 5 1.0 1.4 10000.0 30.00 13.
ITERATING TO FIND MAXIMUM CONCENTRATION . . .

MAXIMUM 1-HR CONCENTRATION AT OR BEYOND 10. M:
104. 6722. 3 1.0 1.2 320.0 30.00 40.

USE DISCRETE DISTANCES? ENTER Y OR N:
N

***************************************
*** SUMMARY OF SCREEN MODEL RESULTS ***
***************************************

CALCULATION MAX CONC DIST TO TERRAIN
PROCEDURE (UG/M**3) MAX (M) HT (M)
-------------- ----------- ------- -------
SIMPLE TERRAIN 6722. 104. 0.


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** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS **
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DO YOU WANT TO PRINT A HARDCOPY OF THE RESULTS? ENTER Y OR N:
So, Answer is B i.e 6749ug/m³ , 104m