Environmental Management

Air Emissions Inventory & Dispersion Modelling

Quantified emissions inventory and AERMOD/CALPUFF dispersion analysis

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Programme overview

Air Emissions Inventory
& Dispersion Modelling

Comprehensive air emissions inventory development covering criteria pollutants, hazardous air pollutants (HAPs), GHGs, and odour. Atmospheric dispersion modelling (AERMOD, CALPUFF) predicts ground-level concentrations against ambient air quality standards and supports permit applications.

Air Emissions Inventory & Dispersion Modelling — Overview
How we deliver it

Our implementation model

A practical, phased delivery approach — from gap assessment through operational embedding — built around your regulatory context.

Source Inventory & Emission Factor Compilation

Compile point-source inventory (stacks, vents, fugitives) and area-source inventory (storage, fugitives, road dust); apply emission factors per EPA AP-42 / EEA EMEP-EEA / IPCC; align with EU IED / US Clean Air Act.

Mass Balance & Activity Data

Build mass balance per source — fuel consumption, raw material throughput, product yield, waste generation; apply emission calculation methods (mass balance > emission factor > engineering estimate per EPA hierarchy).

Stack Testing & CEMS Validation

Conduct stack testing per EPA Method 1-30 / CEN EN 13284 / ISO 9096; validate Continuous Emissions Monitoring System (CEMS) per EPA Part 60 / EU IED Annex V; specify QA/QC per CEMS Performance Specifications.

Dispersion Modelling for Permitting

Conduct dispersion modelling per EPA AERMOD / EU AERMOD-derived; compare predicted concentrations against NAAQS (US) / WHO AQG (international); align with permit application threshold per EPA NSR / EU IED BAT.

Permit Limit & Compliance Tracking

Compare emissions to permit limits per Clean Air Act Title V / EU IED / national permit; design compliance tracking with monthly / quarterly / annual reporting per EPA AERR / EU EPRTR; align with corporate carbon / ESG reporting.

Reduction Programme & BAT Alignment

Identify emission reduction opportunities — process modification (ISD), end-of-pipe (scrubber, baghouse, RTO / RCO / TO, SCR / SNCR); align with EU IED BAT Reference Documents (BREFs) and US EPA MACT standards.

What the programme covers

Air Emissions Inventory — in full scope

Source inventory: stacks, fugitive, area, mobile
Emission factor selection and uncertainty
Continuous emission monitoring (CEMS) data integration
Dispersion modelling and receptor identification
NAAQS, WHO, and site-specific limit verification
Odour and HAPs assessment
Emission reduction option evaluation
Air Emissions Inventory & Dispersion Modelling — Coverage
Business value

Value of Air Emissions Inventory & Dispersion Modelling

Air Pollutant Source & Receptor Protection
  • Protects workers and communities from acute exposure
  • Identifies high-impact emission sources for control
  • Supports emergency planning for release scenarios
  • Fortifies fenceline air quality programmes
EPA 40 CFR / EU IED Air Emissions Defence
  • Satisfies CPCB, US EPA, EU IED stack standards
  • Provides modelling evidence for permit applications
  • Documents NAAQS and WHO compliance
  • Supports cap-and-trade and ETS reporting
Emissions Monitoring & Reporting Quality
  • Identifies leaking and fugitive sources via LDAR
  • Optimises stack height and dispersion design
  • Targets emission control retrofits to highest-impact sources
  • Strengthens CEMS data quality assurance
Air Permit & Non-Compliance Cost Reduction
  • Targets emission control capex to maximise compliance return
  • Avoids fines and consent-order penalties
  • Reduces fenceline community complaint cost
  • Supports green and ESG-linked finance pricing
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