Air Pollutant Emissions Inventory
Comprehensive quantification and characterization of air pollutant emissions from industrial, commercial, and mobile sources. We provide rigorous emissions inventory services that meet regulatory requirements, support air quality modeling, and enable effective pollution control strategies for healthier communities and sustainable operations.
Precision in Emissions Quantification
Air pollutant emissions inventories are fundamental tools for understanding the sources and quantities of pollutants released into the atmosphere. These comprehensive assessments provide the critical data needed for regulatory compliance, air quality modeling, health impact studies, and the development of effective pollution control strategies. Unlike greenhouse gas inventories that focus primarily on climate impacts, air pollutant inventories address the full spectrum of substances affecting local and regional air quality, including particulate matter, nitrogen oxides, sulfur dioxide, volatile organic compounds, carbon monoxide, ammonia, and hazardous air pollutants.
Henddu's air pollutant emissions inventory services deliver rigorous, scientifically-sound assessments that meet regulatory requirements while providing actionable insights for operational improvements. Our multidisciplinary team combines expertise in emission estimation methodologies, source characterization, and regulatory frameworks to produce inventories that serve as reliable foundations for environmental management and decision-making. Whether you're an industrial facility navigating permitting requirements, a municipality developing air quality management plans, or a government agency conducting regional assessments, we provide the technical rigor and practical insight needed to accurately quantify your emissions footprint.
Comprehensive Inventory Services
Multi-Pollutant Quantification
Comprehensive assessment of criteria pollutants (PM2.5, PM10, NOx, SO2, CO, VOC, NH3), hazardous air pollutants (HAPs), and toxic compounds using EPA-approved methodologies and emission factors.
Source Category Analysis
Detailed characterization of point, area, mobile, and other emission sources with activity-specific emission factors, temporal profiles, and spatial allocation for air quality modeling applications.
Regulatory Compliance Support
Inventory development aligned with EPA Title V permitting, National Emissions Inventory (NEI), state implementation plans (SIPs), and regional regulatory programs ensuring full compliance.
Baseline & Trend Analysis
Multi-year inventory development documenting historical emissions trends, identifying key drivers of change, and establishing credible baselines for reduction target setting and progress tracking.
Quality Assurance & Uncertainty
Rigorous QA/QC procedures, uncertainty quantification, and data validation protocols ensuring inventory accuracy and defensibility for regulatory submissions and public disclosure.
Control Strategy Evaluation
Assessment of emission reduction opportunities, control technology effectiveness, and cost-benefit analysis supporting strategic planning and investment decisions for pollution abatement.
Strategic Value of Emissions Inventories
- Achieve and maintain regulatory compliance with federal, state, and local air quality permitting requirements
- Support air quality modeling for National Ambient Air Quality Standards (NAAQS) attainment demonstrations
- Identify emission hotspots and prioritize resources for maximum pollution reduction impact
- Establish defensible baselines for tracking progress toward environmental performance targets
- Inform strategic decisions on facility expansions, process modifications, and equipment investments
- Enhance corporate environmental reporting, ESG disclosures, and stakeholder communications
- Support health impact assessments and environmental justice analyses for communities
- Enable participation in emission reduction credit programs and market-based compliance mechanisms
Our Emissions Inventory Methodology
Source Identification & Characterization
Comprehensive facility assessment to identify all emission sources including process equipment, combustion units, material handling, storage operations, and fugitive sources. We document operating characteristics, control systems, and activity patterns critical for accurate quantification.
Data Collection & Verification
Systematic gathering of activity data from production records, fuel consumption, material throughput, vehicle miles traveled, and operational logs. Source testing data, continuous emission monitoring, and engineering specifications are reviewed and validated for quality and completeness.
Emission Calculations & Modeling
Application of EPA-approved emission factors, mass balance calculations, engineering estimates, or source-specific test data to quantify pollutant releases. We employ AP-42 factors, EMFAC/MOVES models for mobile sources, and industry-specific methodologies ensuring technical rigor.
Quality Assurance & Uncertainty Analysis
Comprehensive QA/QC review including data validation, calculation verification, and reasonableness checks against benchmarks. Uncertainty assessment quantifies confidence levels and identifies data gaps requiring additional investigation or refinement.
Reporting & Strategic Recommendations
Preparation of detailed inventory reports with methodology documentation, results summaries, temporal/spatial profiles, and control strategy evaluations. We provide actionable recommendations for emission reductions, monitoring improvements, and ongoing inventory management.
Quantify Your Emissions with Confidence
Partner with Henddu to develop scientifically-rigorous emissions inventories that meet regulatory requirements and drive strategic environmental improvements.
Request Inventory Assessment