AQS Air Quality Services, LLC
AWMA Air & Waste Management Association
BACT Best Available Control Technology
CAM Compliance Assurance Monitoring
CEMS Continuous Emission Monitoring System
CFR Code of Federal Regulations
CGA Cylinder Gas Audit
CHMM Certified Hazardous Material Manager
CO Carbon Monoxide
CO2 Carbon Dioxide
COMS Continuous Opacity Monitoring System
EDRS Enforcement Document Retrieval System
EIT Education and Information Technologies
EPA Environmental Protection Agency
FESOP Federally Enforceable State Operating Permit
FGD Flue-Gas Desulfurization
H2S Hydrogen Sulfide
HAP Hazardous Air Pollutant
HAZWOPER Hazardous Waste Operations and Emergency Response
HCl Hydrogen Chloride
IDEM Indiana Department of Environmental Management
MACT Maximum Achievable Control Technology
NESHAP National Emission Standard for Hazardous Air Pollutants  
NIST National Institute of Standards and Technology
NOX Nitrogen Oxides
NSR New Source Review
O2 Oxygen
O3 Ozone
PM Particulate Matter
PM10 Particulate Matter (nominally 10m and less)
PM2.5 Particulate Matter smaller than 2.5 Micrometers in Diameter
PSD Prevention of Significant Deterioration
QA/QC Quality Assurance / Quality Control
QEP Qualified Environmental Professional
RATA Relative Accuracy Test Audit
RCRA Resource Conservation and Recovery Act
SO2 Sulfur Dioxide
THC Total Hydrocarbons
TO-12 USEPA test method
TO-14 USEPA test method
TSCA Toxic Substances Control Act
TSP Total Suspended Particulates
USEPA United States Environmental Protection Agency
VOC Volatile Organic Compounds
VOST Volatile Organic Sampling Train