Understanding VOCs: Impact, Health and Regulation in Canada

VOCs: These invisible pollutants that live with us

When we think of air pollution, we often imagine large factory chimneys or exhaust pipes in traffic jams. Yet, the air we breathe inside our homes, offices and schools is sometimes more polluted than the air outside. The main culprits? VOCs, or Volatile Organic Compounds.

What is a VOC, exactly?

Behind this technical term lies a simple reality: VOCs are chemical substances containing carbon and hydrogen. Their particularity lies in their "volatile" nature: they evaporate very easily at room temperature.

Unlike dust, they do not settle on the ground; they mix with the air in gaseous form. In fact, they are often the ones responsible for the "smell of new" furniture or the characteristic odor of a freshly painted room.

Why should we be concerned about VOCs ?

These substances are not just odors. Once released into the air, they easily enter our respiratory system. Depending on the duration of exposure and concentration, the effects can vary:

Health impacts of VOCs

Since we spend nearly 90% of our time indoors, the constant inhalation of these gases is not without consequences. The effects of VOCs on our bodies depend on two factors: the toxicity of the compound and the duration of exposure.

Short-term (Immediate effects)

Often mistaken for fatigue or seasonal allergies, symptoms can include:

• Mucous membrane irritations: Itchy eyes, stuffy nose, or sore throat.
• Neurological disorders: Frequent headaches, dizziness, and unexplained fatigue.
• Skin reactions: Itching or rashing for the most sensitive people.

Long-term (Chronic effects)

Prolonged exposure, even at low doses, can be more insidious:

• Worsening asthma: VOCs are major triggers of attacks in children and people with asthma.
• Systemic toxicity: Certain compounds are classified as carcinogens or endocrine disruptors, which can affect the liver, kidneys, or central nervous system over several years.

Summary of VOC sources and effects

To help you identify the risks in your home, here is a summary table:

Did you know? Our homes are full of sources of VOCs: from cleaning products to home fragrances to the adhesives used in particleboard furniture. Understanding their origin is the first step to regain control over the air quality in your home.

The Environmental impacts of VOCs

The effects of VOCs do not stop at our doorstep. When they escape outdoors (through ventilation or during outdoor construction work), they become major contributors to air pollution.

The major problem with these pollutants is that they thrive in sunlight and heat. Under the sun’s rays, they undergo a chemical transformation and create ground-level ozone (tropospheric ozone), which is the main component of smog—that infamous yellowish haze of pollution hanging over cities.

• Urban smog

  : This is the brownish haze that blankets cities during heat waves. This haze impairs people’s breathing and hinders plant growth by slowing photosynthesis, thereby weakening forests and agricultural crops in Quebec and Canada.

• Acid rain

  : Some VOCs also contribute indirectly to acid rain, affecting the health of forests and waterways. VOCs undergo photolysis (decomposition by light), which creates highly reactive intermediate molecules. These molecules then oxidize sulfur and nitrogen pollutants, transforming them into acids in the atmosphere.

• Climate change

  : Although they are not direct greenhouse gases like CO2, VOCs indirectly warm our planet by trapping terrestrial infrared radiation.

When they mix in the air with other pollutants (such as car exhaust), they create a twofold threat: harmful ozone and harmful microparticles. In short, they contribute to both poor air quality and climate change.

Which industry has a major impact on VOCs in urban areas

To realize the importance of these compounds, one need only look at Environment and Climate Change Canada's data for the year 2018. In urban areas, human pollution by VOCs comes from a variety of sources, but one figure strikes the mind: paints and solvents (37%) represent a more important source of pollution than transport (27%).

Government Action: Regulations and Timetable

Canada has stepped up its efforts to combat VOCs with a series of regulations targeting certain consumer products, building materials, and certain industrial sectors.

Key regulations in force

• Volatile Organic Compound Concentration Limits for Certain Products Regulations (SOR/2021-268)

  : This major regulation limit the concentration of VOCs in approximately 130 product categories (cleaners, personal care, adhesives). The limits have been in effect since January 1, 2024.

• Volatile Organic Compound (VOC) Concentration Limits for Architectural Coatings Regulations (SOR/2009-264)

  : Sets limits for 53 categories of paints and varnishes. It includes seasonal restrictions for road markings to reduce summer smog.

• Volatile Organic Compound (VOC) Concentration Limits for Automotive Refinishing Products Regulations (SOR/2009-197)

  : Regulates 14 categories of products used for body work to protect workers and the environment.

Timeline and future changes

The regulatory framework continues to evolve to include new sectors and strengthen existing limits:

• November 2025: Comments period ends for proposed amendments to the Automotive Refinishing Regulations.
• 2025-2032: Phased in emissions controls at petroleum facilities, aiming for an annual reduction of more than 25,000 tonnes of VOCs by 2032.
• December 31, 2027: End of validity of certain temporary compliance permits granted to companies for specific products.

For more information on the Regulations Limiting the Concentration of Volatile Organic Compounds in Certain Products, read our blog posts.

Reducing Volatile Organic Compound (VOC) Environment Emissions

VOC regulations for Certain Products in Canada