Air Quality Modeling

Air Quality Modeling - Reading: Chap 7.3 Air Quality...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
08/12/09 1 Air Quality Modeling Overview of AQ Models Gaussian Dispersion Model Chemical Mass Balance (CMB) Models Reading: Chap 7.3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
08/12/09 2 Overview
Background image of page 2
08/12/09 3 Overview Air Quality Models are mathematical formulations that include parameters that affect pollutant concentrations. They are used to Evaluate compliance with NAAQS and other regulatory requirements Determine extent of emission reductions required Evaluate sources in permit applications What is the level of my exposure to these emissions? Is my family safe? Where is safe? How about the adverse impact on the environment (plants, animals, buildings)? How to predict the impact of emissions resulting from population growth?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
08/12/09 4 Source Dispersion Model Receptor Model Emission Model Meteorological Model Chemical Model Temporal and spatial emission rates Topography Chemical Transformation Pollutant Transport Equilibrium between Particles and gases Vertical Mixing Types of AQ Models
Background image of page 4
08/12/09 5 Emission Model Estimates temporal and spatial emission rates based on activity level, emission rate per unit of activity and meteorology Meteorological Model Describes transport, dispersion, vertical mixing and moisture in time and space Chemical Model Describes transformation of directly emitted particles and gases to secondary particles and gases; also estimates the equilibrium between gas and particles for volatile species
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
08/12/09 6 Source Dispersion Model Uses the outputs from the previous models to estimate concentrations measured at receptors; includes mathematical simulations of transport, dispersion, vertical mixing, deposition and chemical models to represent transformation. Receptor Model Infers contributions from different primary source emissions or precursors from multivariate measurements taken at one ore more receptor sites. When are model applications required for regulatory purposes?
Background image of page 6
08/12/09 7 Regulatory Application of Models PSD : Prevention of Significant Deterioration of Air Quality in relatively clean areas (e.g. National Parks) SIP : State Implementation Plan revisions for existing sources and to New Source Reviews (NSR)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
08/12/09 8 Classifications of AQ Models Developed for a number of pollutant types and time periods Short-term models – for a few hours to a few days; worst case episode conditions Long-term models – to predict seasonal or annual average concentrations; health effects due to exposure Classified by Non-reactive models – pollutants such as SO 2 and CO Reactive models – pollutants such as O 3 , NO 2 , etc.
Background image of page 8
08/12/09 9 AQ Models Classified by coordinate system used Grid-based Region divided into an array of cells Used to determine compliance with NAAQS
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/11/2011 for the course ENV 4101 taught by Professor Wu during the Spring '08 term at University of Florida.

Page1 / 30

Air Quality Modeling - Reading: Chap 7.3 Air Quality...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online