Environmental and Health & Safety
Acronym Library
Acronym Library
Environmental compliance, hazardous materials, and occupational health and safety are full of technical language and shortened terms that can be confusing without context. This acronym library is designed to be a practical reference for professionals in construction, property management, development, and environmental consulting. Whether you are reviewing reports, managing projects, or navigating regulatory requirements, this resource helps clarify commonly used industry acronyms so you can make informed decisions with confidence.
A
| AC | Air Conditioning | Systems used to cool and dehumidify indoor air. Critical for occupant comfort and protecting sensitive building equipment like server rooms. |
| ACGIH | American Conference of Governmental Industrial Hygienists | A professional organization known for publishing TLVs and BEIs that many jurisdictions reference when setting exposure guidelines. |
| ACM | Asbestos-Containing Material | Any material containing asbestos, for example floor tiles, insulation, or pipe wrap. Its presence triggers requirements for identification, safe handling, and disposal during renovations or demolition. |
| APEG | Professional Engineering Regulators | Provincial bodies that license professionals who may be required to sign technical environmental and safety deliverables. |
| ARO | Asset Retirement Obligation | A legal obligation associated with the future retirement of a tangible asset, such as the costs to decommission a facility or meet clean up obligations. |
| ASHRAE | American Society of Heating, Refrigerating and Air Conditioning Engineers | A standard-setting body for HVAC performance, ventilation, and indoor environmental quality in buildings. |
| AST | Aboveground Storage Tank | A tank used to store hazardous liquids, often fuels or chemicals, above ground. These can create spill and compliance risk if not properly managed. |
| ASTM E1527 | ASTM E1527 Standard | A widely used standard for Phase I Environmental Site Assessments. It sets the process for identifying recognized environmental conditions during due diligence. |
B
| BAS / BMS | Building Automation System / Building Management System | Computer-based systems that control and monitor mechanical and electrical equipment like HVAC and lighting. Often used to improve comfort and energy performance. |
| BOMA | Building Owners and Managers Association | An industry association for commercial real estate, including standards and best practices for building operations. |
C
| CCME | Canadian Council of Ministers of the Environment | An intergovernmental forum that publishes environmental quality guidelines used to evaluate soil, water, and other media. |
| CEPA | Canadian Environmental Protection Act | A key federal law that supports pollution prevention and controls toxic substances to protect the environment and human health. |
| CNESST | Commission des normes, de l'équité, de la santé et de la sécurité du travail | Quebec’s body responsible for administering occupational health and safety, labour standards, and related programs. |
| COC | Contaminant of Concern | A contaminant confirmed at levels that require assessment, management, or remediation based on applicable standards and site conditions. |
| COPC | Contaminant of Potential Concern | A contaminant that may be present based on site history or screening results and may require sampling to confirm. |
| CSR | Contaminated Sites Regulation | British Columbia’s regulatory framework for identifying, investigating, and remediating contaminated land and groundwater. |
D
| DNAPL | Dense Non Aqueous Phase Liquid | A dense liquid contaminant, often chlorinated solvents, that can sink below the water table and become difficult to locate and remediate. |
| DQO | Data Quality Objective | A planning approach that defines what data is needed and what quality is required to support a decision before sampling begins. |
| DSR | Designated Substances Report | A report that documents designated substance findings and implications for the planned work. In Ontario, this often ties back to a Designated Substance Survey. |
| DSS | Designated Substance Survey | An assessment used to identify designated substances that may be present prior to construction or demolition activities, supporting safer work planning and compliance. |
E
| EASR | Environmental Activity and Sector Registry | Ontario’s online registry for certain lower risk activities as an alternative to a full Environmental Compliance Approval. |
| ECA | Environmental Compliance Approval | An Ontario approval that may be required for activities that discharge contaminants to air, land, or water. |
| EUL | Expected Useful Life | The estimated total service life of an asset or building component under typical conditions. Used in condition assessments to support long-term capital planning and forecasting. |
| EHS / HSE | Environment, Health and Safety | A common term for workplace programs or teams responsible for environmental compliance and worker safety. |
| ESA | Environmental Site Assessment | A phased assessment process used to understand environmental conditions and risk at a property, often supporting real estate due diligence. |
G
| GHG | Greenhouse Gas | Gases such as CO2 and methane that trap heat in the atmosphere. Emissions may be subject to reporting and carbon pricing requirements. |
| GHS | Globally Harmonized System | An international system for classifying and communicating chemical hazards, including standard pictograms and label elements used in WHMIS. |
H
| HVAC | Heating, Ventilation and Air Conditioning | Mechanical systems that manage temperature, humidity, and ventilation. HVAC performance influences indoor air quality and occupant comfort. |
| HWIN / RPRA | Hazardous Waste Information Network / Resource Productivity and Recovery Authority | Ontario’s system for tracking hazardous waste movements and documentation. |
I
| IAQ | Indoor Air Quality | A measure of air conditions within a building that can affect health and comfort, including ventilation, particles, and chemical vapours. |
J
| JHSC | Joint Health and Safety Committee | A worker and management committee required in many workplaces to identify hazards, support prevention, and improve safety performance. |
L
| LEL | Lower Explosive Limit | The lowest concentration of a vapour or gas in air that can ignite. Used in confined space planning and hazardous work controls. |
| LNAPL | Light Non Aqueous Phase Liquid | A liquid contaminant lighter than water, such as gasoline, that can float on the groundwater table and spread laterally. |
M
| MECP | Ministry of the Environment, Conservation and Parks | Ontario regulator responsible for environmental approvals, compliance, spills, and related programs. |
| MOECP | Ministry of the Environment, Conservation and Parks | Older or alternate abbreviation used in documents and conversation for Ontario’s environment ministry. Treat it as MECP for practical purposes. |
N
| NPRI | National Pollutant Release Inventory | Canada’s public inventory of pollutants released to air, water, and land by certain facilities. |
O
| O. Reg. 278/05 | Ontario Regulation 278/05 | Ontario regulation addressing asbestos on construction projects and in buildings, including survey, notification, and control requirements. |
| O. Reg. 490/09 | Ontario Regulation 490/09 | Ontario regulation governing designated substances and related requirements that may apply to certain projects and workplaces. |
| OEL / TLV | Occupational Exposure Limit / Threshold Limit Value | Limits used to evaluate worker exposure to airborne contaminants. Terminology and enforceability vary by jurisdiction and guideline source. |
| OHSA / OHS Act | Occupational Health and Safety Act | Primary workplace safety legislation. Requirements and terminology vary by province, but the intent is consistent: protect worker health and safety. |
P
| PAH | Polycyclic Aromatic Hydrocarbons | A group of contaminants often associated with petroleum and combustion byproducts. Commonly evaluated in soil and sediment investigations. |
| PCB | Polychlorinated Biphenyls | Highly regulated toxic chemicals once used in electrical equipment. Storage, handling, and disposal requirements are tightly controlled. |
| PEL | Permissible Exposure Limit | A legally enforceable exposure limit set by a regulator. Values and definitions vary by jurisdiction. |
| PPE | Personal Protective Equipment | Equipment such as respirators, gloves, and fall protection used to reduce worker exposure when other controls are not sufficient. |
Q
| QP | Qualified Person | A designated professional authorized to sign off on certain environmental submissions in a jurisdiction, such as an Ontario Record of Site Condition. |
R
| RAP | Remedial Action Plan | A plan describing how contamination will be addressed, managed, or remediated to meet applicable criteria and support project goals. |
| RUL | Remaining Useful Life | The estimated time an asset or building component can continue to perform as intended before repair or replacement is likely needed. Used to prioritize near-term repairs and support capital planning timelines. |
| RSC | Record of Site Condition | An Ontario filing that documents site assessment work and, where applicable, confirms the property meets standards for the intended use. |
S
| SDS | Safety Data Sheet | A document that describes chemical hazards, safe handling, first aid, and emergency measures. Used to support WHMIS compliance and worker training. |
| STEL | Short Term Exposure Limit | A maximum exposure allowed over a short period, commonly 15 minutes, used to help prevent acute health effects. |
| SVOC | Semi Volatile Organic Compound | A class of compounds that can persist in air, dust, and soil. Often reviewed during contamination and indoor environment investigations. |
T
| TDG | Transportation of Dangerous Goods | Federal requirements for classification, documentation, packaging, and transport of dangerous goods. Relevant for waste, chemicals, and spill response planning. |
| TWA | Time Weighted Average | An average exposure over a defined period, typically an 8 hour shift, used to assess longer term exposure. |
U
| UEL | Upper Explosive Limit | The highest concentration of a vapour or gas in air that can ignite. Above this level there may be insufficient oxygen for combustion. |
| UST | Underground Storage Tank | A tank with at least 10 percent of its volume underground. These can represent elevated environmental risk due to leak potential and remediation cost. |
V
| VOC | Volatile Organic Compounds | Compounds that readily evaporate and can affect air quality. Often associated with paints, solvents, and fuel related sources. |
W
| WCB / WSIB | Workers' Compensation Board / Workplace Safety and Insurance Board | Provincial bodies that manage workplace insurance and injury claims and support safety and prevention programs. |
| WHMIS | Workplace Hazardous Materials Information System | Canada’s hazard communication standard for workplace chemicals, including labelling, SDS requirements, and worker education. |
Need help translating?
If you’re looking at a report, a compliance requirement, or a planned project and want to better understand what all these acronyms mean for your building or site, our team of experts can help. We translate technical terms into clear next steps so you can manage risk, stay compliant, and keep work moving with fewer surprises.
