The Government of Canada undertook a thorough scientific review of the potential impacts of plastic pollution on human health and the environment.
The purpose of the science assessment was to summarize the current state of the science regarding the potential impacts of plastic pollution on human health and the environment, as well as to guide future research and inform decision-making on plastic pollution in Canada.
Based on the information provided in the science assessment, the Government is moving forward with regulatory measures under the Canadian Environmental Protection Act, 1999 (CEPA) to protect the environment from plastic pollution.
About plastic pollution
Plastic pollution is considered to be plastic that is discarded, disposed of, or abandoned in the environment outside of a waste management system (such as a recycling facility or a landfill).
In an environmental context, plastics are often categorized by size, with macroplastics being larger than 5 millimetres (mm) and microplastics being less than or equal to 5 mm.
The improper management of plastic waste has led to plastic pollution becoming ubiquitous in all parts of the environment.
Plastic pollution has been found on shorelines and in surface waters, sediment, soil, groundwater, indoor and outdoor air, drinking water and food. It has also been found in the digestive tracts of animals.
There is increasing global concern that plastic pollution may negatively impact human health and negatively impacts the environment.
The discussion paper, A Proposed Integrated Management Approach to Plastic Products to Prevent Waste and Pollution, outlined a methodology to categorize single-use plastic and provided details on other risk management measures being considered.
Release to the environment
Plastics enter the environment through various sources, which may include litter, mismanaged waste, fishing based activities, or agricultural activities.
Plastics from land and water-based activities can be released into the environment:
as macroplastics in their initial manufactured form, for example, as discarded single-use plastic bags and straws, or through spillage during transport;
as macroplastics in the form of large pieces of plastics, for example, abandoned, lost or discarded fishing gear; or
as microplastics, for example, microfibres released from washing clothes.
Microplastics can come from the breakdown of larger plastic items in the environment.
The presence of microplastics in indoor air is the result of shedding of fibres from clothing, furniture, carpeting and household goods, while the presence of microplastics in outdoor air is influenced by various sources including vehicle tire wear and tear.
Human and environmental exposure
The science assessment indicates that Canadians may be exposed to microplastics by eating food and drinking bottled water and tap water, as well as from breathing indoor and outdoor air. However, exposure to microplastic pollution is not expected to be of concern for human health.
Single-use plastic litter is found on shorelines across Canada, and microplastic particles are found in fresh and marine surface waters. These particles have been found in aquatic organisms, specifically fish and shellfish. In addition, microplastic particles may eventually sink in aquatic environments, leading to their accumulation in the bottom sediment. Microplastics are also found in soil.
Science assessment findings
The Government of Canada summarized scientific information on plastic pollution in a science assessment published on October 7, 2020. Information included in the assessment indicates that plastic pollution, in both macroplastic and microplastic form, is everywhere in the environment.
Macroplastics have been shown to cause physical harm to individual animals and to have the potential to negatively affect the habitat of animals.
The evidence for potential effects of microplastics on individual animals, the environment, and human health is less clear and requires more research.
The Government proposed that action be pursued to reduce the presence of plastic pollution in the environment.
The assessment also recommends that more research is needed in the following areas:
developing standardized methods for sampling, quantifying, characterizing, and evaluating the effects of macroplastics and microplastics;
furthering the understanding of the ecotoxicological effects of microplastics;
furthering the understanding of human exposure to microplastics;
furthering the understanding of the effects of microplastics on human health; and,
expanding and developing consistent monitoring efforts to include parts of the environment which are less studied, such as soil.
Preventative actions on plastic pollution and waste
The discussion paper on A Proposed Integrated Management Approach to Plastic Products to Prevent Waste and Pollution was published on October 7, 2020 for a public consultation period, ending on December 9, 2020.
The integrated management approach takes into consideration barriers to reaching zero plastic waste such as weak end-markets for recycled plastics, low collection rates and insufficient recovery options.
The discussion paper presented a comprehensive approach for managing plastics, including potentially banning or restricting 6 problematic single-use plastics, setting performance requirements that would establish recycled content requirements and working to expand extended producer responsibility in Canada.