air quality modeling Articles
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Proposed Revisions to the Guideline on Air Quality Models (Appendix W)
On July 14, 2015, the U.S. Environmental Protection Agency’s (U.S. EPA’s) Office of Air Quality Planning and Standards’ (OAQPS) Air Quality Modeling Group provided a pre-Federal Register (FR) publication of the proposed revisions to the Guideline on Air Quality Models (Appendix W to 40 CFR Part 51) (Guideline) on the U.S. EPA’s Support Center for Regulatory Atmospheric ...
By All4 Inc.
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The air quality Model Documentation System of the European Environment Agency
With the aim of providing objective, reliable and comparable information on air pollution models, the European Topic Centre on Air Quality (ETC/AQ) has developed a concept for an air quality Model Documentation System (MDS) to be accessible on the internet. The aim of the system is to include adequate information on the individual models, their application areas, and their status with respect to ...
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Towards uncertainty mapping in air-quality modelling and assessment
The aim of this paper is to promote the use of uncertainty mapping when spatial assessments of air quality are made. A large number of air quality maps are produced for scientific and policy purposes but rarely are corresponding maps of their uncertainty included. The need for such maps and the methods to produce them are described. Several uncertainty parameters are discussed but it is ...
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MODELS-3/CMAQ evaluation during high particulate episodes over Eastern North America in summer 1995 and winter 1998
This study presents the results of an evaluation of the US EPA air quality modelling system MODELS 3/CMAQ/MM5 during episodes of high particulate matter over Eastern North America. Modelling results for PM2.5, PM10, secondary aerosols and precursor gases were compared with observed data derived from a number of monitoring networks operated in the USA and Canada during the episodes.Keywords: ...
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ALL4 Air Quality Modeling Update
As it’s been over a year since my last air quality modeling-related 4TR article, I thought it appropriate to provide a general status report on the air quality modeling updates that have occurred over the last year. There are a number of items that warrant discussion around their updates and the potential impacts on the regulated community, specifically: A new version of U.S. ...
By All4 Inc.
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Effect of different meteorological fields on the regional air quality modelling over Pearl River Delta, China
This study evaluates the performances of three Community Multiscale Air Quality (CMAQ) model v5.0 simulations that utilise meteorological input data from the 5th-generation Mesoscale Model (MM5), the Weather Research and Forecasting (WRF) model and WRF with Four-Dimensional Data Assimilation (WRF/FDDA). Three sets of CMAQ model simulations were performed for a high air pollution episode from ...
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Environmental impact assessment of air quality in street canyons related to council directives 1999/30/EC and 2000/69/EC
Council directive 96/62/EC on ambient air quality assessment and management requires the development of action plans for zones where concentrations of pollutants in ambient air exceed limit values. The directive also recognises air quality models as assessment tools. We discuss the application of an integrated air quality model, Air quality modelling in Urban Regions using an Optimal Resolution ...
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The application of models under the European Union`s Air Quality Directive: A technical reference guide
This technical reference guide provides a general overview of the use of models with regard to the consolidated Directive 2008/50/EC on ambient air quality and cleaner air for Europe (theAQ Directive). This guide has three key aims: To provide common technical guidance for the use of air quality (AQ) modelling in relation to the EU's AQ Directive; To provide a central reference point for the ...
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Methodology for a comparative evaluation of two air-quality models
This paper presents a methodology for conducting an objective comparative evaluation of two air-quality models using several datasets. This methodology is designed to be simple to implement and understand, to reliably discern improvement in performance, and to accommodate the use of datasets from a variety of field studies of varying quality. The reliability of the comparison is enhanced by the ...
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Development of a GIS-based urban air quality modelling system for transport-related pollution
In recent years motor vehicles have become the dominant source of air pollution in metropolitan areas. Hence, the assessment of transport-related air quality is of major concern to policymakers and municipal planners. This paper describes an urban air quality modelling system for evaluating the environmental effects of transport related air pollution. A preliminary evaluation of the model has ...
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Fine Particulate Series (Part 3): PM2.5 prevention of significant deterioration (i.e., Attainment) – What you need to know
U.S. EPA’s final rules (and policies) governing the implementation of the New Source Review (NSR) program for fine particulate matter (i.e., particulate matter with an aerodynamic diameter less than 2.5 microns, or PM2.5) are now being implemented. In the March 2009 issue of 4 The Record, ALL4’s PM2.5 Team discussed the technical basics of PM2.5. Then, in the April 2009 issue, ...
By All4 Inc.
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Developing a fast photochemical calculator for an integrated assessment model
The use of integrated assessment models, in air quality policy, which combines atmospheric models with others from different fields, raises the need of developing specific air quality modelling concepts. The air quality model, AUSTAL2000–AYLTP uses an adapted version of AUSTAL2000 model to calculate transport coupled with a fast photochemical module. Two approaches are compared: one using a ...
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CAMxRunner: a modular framework for efficient chemical transport modelling
Since many political decisions concerning air quality are based on models, modelling reproducibility and quality assurance are of interest to a wide audience. We developed a modular computer program called CAMxRunner to address this need. CAMxRunner automates runs of the Comprehensive Air quality Model with extensions (CAMx) including pre– and post–processing. Except for the ...
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PM2.5 Air Quality Modeling Updates
There has been much activity over the past six (6) months that will impact how air quality modeling analyses will be conducted for Prevention of Significant Deterioration (PSD) permit applications with respect to particulate matter less than 2.5 microns (PM2.5). As the resident air quality modeling expert at ALL4, I thought it was a good time to walk through each of these changes and discuss the ...
By All4 Inc.
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The role of temperature in tropospheric ozone
After evaluating some meteorological simulations, we detect an error of over 5°C in surface temperature. In order to assess the effect of this anomaly in temperature, we perform new simulations of an emission model and a photochemical model using the correct surface temperature in the meteorological data. Our goal is not to solve the problem in surface temperature estimates, but to reveal how it ...
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Secondary organic aerosol formation from naphthalene roadway emissions in the South Coast Air Basin of California
Naphthalene is the simplest and most abundant polycyclic aromatic hydrocarbon (PAH) in California fuels, with concentrations of up to 2,600 mg L –1 in gasoline and 1,600 mg L –1 in diesel fuel. In this work, naphthalene emission factors for gasoline and diesel vehicles are combined with an activity-based automobile inventory to characterise anthropogenic naphthalene emissions in the South ...
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Comparative evaluation of two air quality models: within-regime evaluation statistic
At the Workshop on Operational Short-Range Atmospheric Dispersion Models for Environmental Impact Assessment in Europe, Lee and Irwin (1994) presented a methodology for conducting an objective comparative evaluation of two or more air quality models. The methodology involved the use of bootstrap resampling to allow computation of confidence bounds on model comparison measures, and an inverse ...
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The study of traffic hotspot air quality and street scale modelling in the Street Emission Ceilings (SEC) Project
The introduction of local scale analysis in Integrated Assessment Modelling (IAM) requires an evaluation of road transport emission factors and local scale air quality models. The comparison of PM10 and PM2.5 over NOx delta (street level minus background) concentration ratios against emission ratio estimates, confirms the appropriateness of the COPERT methodology. The comparison also reveals the ...
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The Air Quality Management Decision Support System (AQMDSS) for Beijing, People's Republic of China
The People's Republic of China (PRC) has been experiencing rapid economic and industrial growth with associated increased air pollution. Government officials strive to improve air quality while maintaining growth. Implemented control measures have not achieved air quality goals; therefore, the Beijing Municipal Environmental Protection Bureau turned to air quality models to help identify sources ...
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Inter-comparison of predicted population exposure distributions during four selected episodes in Helsinki and evaluation against measured data
Air pollution causes significant excess mortality and health effects. Action plans required by the EU legislation should optimally account for the complex interactions of population distributions, time-activity and the sources of air pollution. This paper presents FUMAPEX study results on probabilistic exposure modelling for evaluation of population exposure distributions during selected episodes ...
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