1. INPUT DATA REQUIREMENTS
MODULE 1
INPUT DATA REQUIREMENTS

2. TYPES OF INPUT DATA Source/spill data Meteorological data Site data
Receptor data
Air quality data (background, ambient and indoor)
Deposition data
Risk data

3. NEED FOR INPUT DATA To assure optimum performance of the model
To find the possible source of emissions and rectify it

4. SOURCE/SPILL DATA Emission rate Physical and chemical data
Geometry and location of source
Plant operation
Terrain features near the source
Fraction of liquid, gas and aerosol

5. METEOROLOGICAL DATA Typical meteorological data include Wind velocity
Cloud cover and net radiation
Temperature
Turbulence
Relative humidity
Atmospheric stability

6. Meteorological stations
Meteorological data are collected by weather bureau pollution control agencies industries and local universities
Meteorological stations
Generally one for flat terrain and more than
one for complex terrain.

7. SITE DATA A Site map shows location of sources
dimensions of nearby buildings
terrain features (urban/rural)
surface roughness
Other equipment locations
Plant boundaries
Site data helps in classifying downwash conditions

8. Point or site where air pollution concentration is measured is called the receptor site
Common grids used for placing receptor sites are:
Square grid
Rectangular grid
Circular grid
Irregular grid

9. SQUARE GRID CIRCULAR GRID

10. Location or placing of receptor points
The receptor points should be located in a manner that
Points of maximum concentration should be spotted
Sensitive places like schools, day care centers, hospitals, old age homes etc. are included
Highly populated areas and water bodies are covered

11. BACKGROUND AIR QUALITY DATA
At any time there is some concentration of pollutant which is present in the atmosphere due to natural sources as well as unidentified man made sources.
Important factors to be considered for background air quality data are:
the point or area where there is a conjunction of all the sources
the point of maximum impact from the source
the area of maximum impact from other (nearby) sources.

12. AIR QUALITY DATA Background concentration Ambient air concentration
Indoor concentration

13. DEPOSITION DATA
The pollutant after its release into the atmosphere gets deposited on
Water
Land
Vegetation
Snow
Data required: Deposition velocity, Precipitation rate
These deposition data are then used to estimate risk through non-inhalation pathways

14. The risk data includes the following:
Exposed population
Exposure routes
Inhalation route
Non-inhalation route
Unit risk factors
Potency slopes
Chronic reference dose

15. The chemicals are classified as either
carcinogenic or
non-carcinogenic
Exposures may be
intermittent
chronic
Multi exposure pathways for each chemical should be studied

16. Primary pathways are those in which the pollutant enters the human body directly.
The data are required for the following primary pathways:
dermal exposure
water ingestion
crop ingestion (direct deposition)
soil ingestion

17. Secondary pathways are those in which the pollutants are acquired by humans from a source which is infected by the pollutant already.
The data are required for the following secondary pathways:
Mother`s milk
Fish ingestion
Crop ingestion (root uptake)
Poultry meat and eggs
Meat (others)
Dairy products

18. The slope factor for a chemical relates the chronic dose to the lifetime risk.
Slope factor = risk / unit dose
For a non-carcinogenic chemical
Hazard index = dose / chronic reference dose