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Air pollution is a concern in British Columbia, Canada because of its effects on health and visibility. Air quality is influenced in British Columbia (BC) by numerous mountain ranges and valleys, which complicate atmospheric pollution dispersion and can lead to high concentrations of pollutants such as particulate matter from wood smoke (especially during stagnant atmospheric conditions/inversions).

Air quality in much of BC is good compared to many areas of North America. This is particularly true for cities in BC such as the Greater Vancouver area and Victoria. Valley communities such as Golden may experience periods of poor air quality, particularly during stagnant atmospheric conditions. Two communities currently exceed the federal standards for maximum safe levels of pollutants: Prince George for particulate matter (PM2.5), and the community of Hope in the lower Fraser Valley for ozone. Other communities are close to the PM2.5 standard, such as Quesnel, Kamloops, Chiliwack, and Langley. Hourly air quality monitoring results are available for the lower Fraser Valley. Air quality information is available for the rest of the province from the Ministry of the Environment. The BC Lung Association produces an annual State of the Air Report for BC. This report is a collaboration between the provincial, federal and regional governments responsible for air quality management in BC. An important recent consideration is the nearly complete replacement of the TEOM (Tapered Element Oscillating Microbalance) pollution measurement instruments once relied on by BC with newer SHARP FEM (Federal Equivalency Method) monitors. The TEOMs often under reported particulate matter measurements by 50%. A process of colocation and auditing of operations will make the new and higher readings more reliable. A more complete understanding of conditions will lead to a greater understanding of likely impacts and may drive increased regulatory efforts. These measurements sample ambient air – that is, air where people might breathe it and are usually reliable and available. They do not include the air in workplaces. A possibly trickier assessment is determining where pollution comes from, often a question addressed by emissions inventories. In BC and other Canadian jurisdictions, facilities are required to report their toxic substance emissions to Environment Canada on an annual basis. Self reporting tends to lead to under reporting, notwithstanding which the inventory resulting tracks releases in an interesting way. At the NPRI we can see a complex example in the historical report summary of Canfor's NPRI reporting in recent years. Criticisms of such reporting has been done by Scott Vaughan, Commissioner for Sustainable Development and the Environment in his Fall 2009 report. It is worth noting that the government only recently began addressing air quality when the problem was increasingly associated with health issues and generated complaints about smog and poor visibility. There is no major agency for air quality at the provincial and federal levels. The BC Ministry of Environment added a branch in 1980 for air quality and it received a small budget annually for almost a decade. After the 1990s, resources allocated to air quality grew rapidly and this was particularly the case for the Greater Vancouver Regional District (GVRD) through its air management plan. and those internal to it; and between anthropogenic (man made) sources and natural sources. External anthropogenic sources include combustion particles and gases from industrial sources in the province of Alberta or the U. S. state of Washington. Toxic substances form part of these pollutants such as tetrachloroethylene and trichloroethylene as well as nitrogen monoxide and sulfur dioxide, which Canada seeks to minimize through caps and its tradable permit system. Mount St. Helens has been a significant external natural source: although located entirely in the United States, its eruption created air pollution in parts of British Columbia. Exhaust from internal combustion engines (mainly automobiles and trucks, as well as marine vessels in coastal waters) is a major internal anthropogenic source. Other human caused sources include: Industrial, agricultural (e. g. manure spreading), commercial operations (e. g., dry cleaners and gas stations) and home heating appliances (furnaces, fireplaces). Radionuclides are generally not a concern with regards to air pollution issues in BC, except for radon gas. Background pollution occurs in areas not directly affected by pollution sources.

The Canadian Constitution does not clearly specify the level of government that has responsibility for environmental protection in Canada. As such, pollution law in British Columbia is divided among local, regional, provincial, federal and international jurisdictions, each with its own focus and, at times, overlapping concerns. Legislation may be enacted at any of these levels.

Federal pollution law is largely embodied in the Canadian Environmental Protection Act (CEPA) and its associated schedules. The act of scheduling a toxin under CEPA starts a process of elimination or virtual elimination from the Canadian environment. The National Pollutant Release Inventory indexes sources by pollutant and location. In 2012 the CCME started the Air Quality Management System process. This provided for the evaluation of PM and ozone measurements at many sites in BC and across Canada. In 2015 the first air zone reports for BC were published. They show that Crofton, Smithers, and Vanderhoof are not meeting the PM2.5 standard. This is a trigger for corrective intervention. The exact type of intervention is not yet determined, partly because it's a new process and partly because of variable site specific factors. It's not likely that one size fits all in correction. Pollution law governing emissions from marine vessels is complicated; Transport Canada holds primary authority for regulating ship traffic in Canada, while the International Maritime Organization governs global shipping rules (including pollution from marine vessels). Environment Canada and other agencies are working to better understand and address this issue, which is increasingly important due to growing international trade.

Within the province, various Regional Districts and municipalities have enacted laws to control pollution. There are also area based plans to manage pollution along geographic lines that recognize airsheds instead of political boundaries. This system is especially relevant to BC because of its mountainous topography. The BC Environmental Management Act recognizes airsheds and notes that managers under the Act "may give consideration" to them, but their full legal status is uncertain. Some plans have had a considerable effect, and this trend is likely to continue. The Greater Vancouver Regional District (GVRD) has a clearly defined role in air pollution control and has delegated authority from the province (Montreal is the only other jurisdiction in Canada with this delegated authority). The Fraser Valley Regional District has delegated authority to plan but not manage air quality. British Columbia is a participant in the Canadian Council of Ministers of the Environment (CCME), which includes processes for fine particulates and ground level ozone. Because BC generally has lower levels of pollution than the standards set by the Environmental Protection Act, the CI/KCAC ("Continuous Improvement" and "Keeping Clean Areas Clean") principle of the federal strategy is of special importance. International law and treaties such as the Kyoto Accord further affect air pollution in BC. The precautionary principle embodied in international agreements is gaining recognition in Canada and BC as a guide to interpreting pollution law. Its exact application is uncertain but it is cited in the preamble to the Canadian Environmental Protection Act as a principle guiding the Government of Canada.

The health effects of air pollution vary with the size and characteristics of the exposed population, the specific pollutant or mix of pollutants and the concentration of pollutants, both in the short term and the long term. Children, the elderly, and people with pre existing health problems are known to be especially vulnerable. Generally speaking, respiratory and cardiac effects are the most significant, but there is increasing evidence that air pollutants play a role in cancer and genetic mutations, some of which can be inherited. Cumulative and synergistic effects are hard to study: ethical concerns rule out some otherwise desirable experimental procedures, and multi pollutant studies are complex and expensive, leaving these areas less well understood experimentally. Sometimes ecologic studies can contribute to our understanding of combined effects. In the early 1990s, the province commissioned Dr. Sverre Vedal, then a researcher at the University of British Columbia, to investigate air pollution in BC, and to assess and to rank its health impacts. His report concluded that particulate pollution was the gravest concern, estimating an annual toll of 82 deaths, among other consequences. As of late 2004, the province continues its long term effort to control sources of particulates. The varying population and topography have given rise to different problems in different areas, necessitating differing approaches. Other important air pollutants are oxides of nitrogen and of sulphur, volatile organic compounds of various kinds, polycyclic aromatic hydrocarbons, dioxins and furans. Exposure and health effects of these vary by area and sometimes by season. Recent air pollution research in Canada and other jurisdictions was summarized by Health Canada in October 2003 in its report Human Health Effects of Fine Particulate Matter, which has informed standards setting deliberations of the CCME. Research in British Columbia has been ongoing since at least 1990. The BC Lung Association has commissioned work in this field, including a 2003 analysis by Dr. David Bates and others, Health and Air Quality 2002—Phase 1. The second phase of this report was to deal with health effects of fine particulates in northern BC communities, where biomass combustion is arguably the most important source. Ray Copes and Catherine Elliott estimated mortality in northern BC in their report. At the end of 2004, Provincial Health Officer Dr. Perry Kendall released his annual report titled Air Quality in British Columbia, A Public Health Perspective. It includes estimates of the health impact of air pollution in BC. He estimates that 71–110 deaths are attributable to air pollution. This figure excludes effects of indoor air pollution and environmental tobacco smoke exposure. On a national and regional scale, the Canadian Medical Association in 2008 quantified the illness costs of air pollution. The report includes business as usual projections of the increased burden in the coming decades.