New Programme to Tackle Black Carbon and Protect Health

New funding targets black carbon’s dual threat to health and climate

Wellcome has announced a multi-million pound programme to strengthen the evidence base on black carbon emissions and support action to reduce them. The initiative addresses a pollutant that causes serious harm to human health while contributing to near-term global warming. Better evidence could enable governments and policymakers to make more informed decisions on regulation and funding.

Black carbon is a component of fine particulate matter, already recognised as a major air pollutant. However, gaps in the evidence base have limited targeted intervention and regulation in some areas. The new programme aims to close those gaps and accelerate reductions in emissions.

Black carbon’s role as a short-lived climate pollutant

The World Health Organization has concluded that epidemiological studies provide sufficient evidence of associations between black carbon exposure and cardiopulmonary morbidity and mortality. The Climate and Clean Air Coalition describes black carbon as a short-lived climate pollutant that damages health while contributing to atmospheric warming.

Unlike carbon dioxide, which persists in the atmosphere for decades, black carbon remains airborne for only days to weeks. As a result, cutting emissions can deliver relatively fast benefits for both air quality and climate. This characteristic makes black carbon an important target for interventions that can produce measurable improvements within years rather than decades.

The pollutant forms through incomplete combustion of fossil fuels, biofuels, and biomass. Major sources include diesel engines, domestic cooking and heating, agricultural burning, and some industrial processes. Concentrations are typically highest in low-income regions where older vehicles, solid fuel cooking, and open burning remain common.

Health impacts linked to cardiovascular disease and mortality

Black carbon has been associated with a range of serious health outcomes. Cardiovascular effects include increased risk of heart attacks and strokes. Research has also identified links to pregnancy and birth outcomes, including low birth weight.

The Clean Air Fund estimates that black carbon contributes to over eight million premature deaths annually when considered as part of broader particulate pollution. These deaths occur primarily in populations exposed to high concentrations from household energy use, transport, and industrial emissions.

Particulate matter less than 2.5 micrometres in diameter, known as PM2.5, can penetrate deep into the lungs and enter the bloodstream. Black carbon is a significant component of PM2.5 in many urban and rural environments. Consequently, reducing black carbon emissions can lower overall exposure to fine particulates.

Health harms are not distributed evenly. Communities near busy roads, those reliant on solid fuels for cooking and heating, and populations in regions with limited air quality regulation face disproportionately high exposure. Children, older adults, and people with existing respiratory or cardiovascular conditions are particularly vulnerable.

Philanthropy targets black carbon as a distinct policy priority

The Wellcome programme builds on a growing consensus among researchers and funders that black carbon warrants dedicated attention, not just as part of general PM2.5 control. The Clean Air Fund has committed $12.9 million to a separate programme that will generate scientific research, build coalitions, and implement solutions to cut black carbon emissions.

This shift reflects a strategic change in how philanthropic organisations and policymakers approach air quality. Previously, black carbon was often addressed indirectly through broader particulate matter regulations. However, its unique combination of health and climate impacts has prompted calls for specific targets and interventions.

Project Drawdown argues that reducing black carbon emissions could prevent millions of premature deaths and generate major economic benefits. The economic case is strongest in low-income regions where exposure is highest and health systems are least able to manage pollution-related disease.

Evidence generation is a central component of both the Wellcome and Clean Air Fund programmes. Researchers need better data on emission sources, exposure levels, and the effectiveness of different interventions. For example, information on which household cooking technologies reduce black carbon most effectively can guide subsidy programmes and product standards.

Policy implications for climate and health planning

The new funding could help move black carbon from a research issue to a more explicit emissions target in national and international climate and health planning. The Clean Air Fund has called for black carbon to be integrated into enhanced nationally determined contributions with a target separate from carbon dioxide, methane, and other greenhouse gases.

This approach would align black carbon control with the Paris Agreement framework, which currently focuses primarily on long-lived greenhouse gases. Adding black carbon targets could accelerate near-term climate action while delivering immediate health benefits. Countries with high emissions from transport, residential energy, or agriculture could see particularly strong co-benefits.

Governments may be able to justify faster action in high-emitting sectors if researchers can better quantify where black carbon comes from, how much it harms health, and which interventions work best. Transport is one priority area. Diesel particulate filters, low-emission zones, and fleet electrification can all reduce black carbon from vehicles.

Household cooking and heating represents another major source. Transitioning from traditional biomass stoves to cleaner fuels or improved cookstoves can substantially cut emissions. However, programmes must account for affordability, cultural preferences, and fuel availability to achieve sustained adoption.

Industrial sources, including brick kilns, coke ovens, and heavy-duty machinery, also contribute significantly in some regions. Regulatory standards, technology upgrades, and fuel switching can all play a role. Agricultural burning, while more difficult to control, can be reduced through alternative residue management practices and enforcement of burning bans during high-pollution periods.

Black carbon as a super pollutant with multiple impacts

Black carbon is sometimes described as a super pollutant because of its potency as both a health hazard and a climate forcer. Gram for gram, black carbon has a much stronger warming effect than carbon dioxide over short time periods. It absorbs sunlight and radiates heat, warming the atmosphere directly. When deposited on snow and ice, it reduces surface reflectivity and accelerates melting.

These climate effects are especially pronounced in regions with significant snow and ice cover, including the Arctic and high-altitude areas. Black carbon deposition on glaciers has been linked to accelerated retreat, with implications for water supplies and sea level rise. In the Arctic, it contributes to feedback loops that amplify regional warming.

The dual impact on health and climate creates opportunities for policy interventions that deliver benefits across multiple domains. Air quality regulations that reduce black carbon emissions can simultaneously improve public health, reduce near-term warming, and contribute to climate adaptation in vulnerable regions.

However, designing effective policy requires understanding which sources contribute most to which impacts. For example, black carbon from diesel engines may have different health implications than emissions from agricultural burning, depending on particle size, composition, and population exposure patterns. Similarly, climate impacts vary depending on where emissions occur and where particles are eventually deposited.

What the funding programmes aim to achieve

• Wellcome is funding a multi-million pound programme to close evidence gaps on black carbon’s health and climate impacts and support action to cut emissions.
• The World Health Organization has concluded that epidemiological studies provide sufficient evidence of associations between black carbon exposure and cardiopulmonary morbidity and mortality.
• Black carbon has been linked to cardiovascular disease, including heart attacks and strokes, as well as adverse pregnancy and birth outcomes such as low birth weight.
• The Clean Air Fund estimates that black carbon contributes to over eight million premature deaths annually when considered as part of broader particulate pollution.
• Black carbon is a short-lived climate pollutant that remains in the atmosphere for days to weeks, meaning emission reductions can deliver relatively fast health and climate benefits.
• The Clean Air Fund has called for black carbon to be integrated into enhanced nationally determined contributions with a target separate from carbon dioxide, methane, and other greenhouse gases.
• Major sources of black carbon include diesel engines, household cooking and heating, agricultural burning, and some industrial processes, with concentrations typically highest in low-income regions.

How UK businesses can respond to evolving air quality evidence

While the Wellcome programme focuses on global evidence generation, UK businesses in certain sectors should monitor how strengthened evidence on black carbon may influence domestic and international regulation. Companies with operations in transport, manufacturing, or energy-intensive industries may face tighter emissions standards as the evidence base improves.

Fleet operators should consider the trajectory of clean air policy in urban areas. Low-emission zones are expanding across UK cities, and future regulations may include more specific controls on particulate matter. Transitioning to cleaner vehicles ahead of regulatory deadlines can avoid compliance costs and operational disruption.

Businesses that operate internationally, particularly in regions where black carbon emissions are high, may encounter supply chain implications. Customers and investors are increasingly attentive to air quality impacts alongside carbon footprints. Furthermore, companies bidding for public sector contracts should note that environmental standards in procurement are tightening.

Manufacturers can review combustion processes and equipment to identify opportunities to reduce particulate emissions. In some cases, fuel switching or process modifications can cut black carbon alongside other pollutants. Consequently, businesses may achieve multiple compliance and sustainability objectives through a single intervention.

For businesses supporting net-zero programmes, black carbon represents an area where climate and health benefits align closely. Reducing short-lived climate pollutants can complement longer-term decarbonisation strategies and demonstrate broader environmental commitment. Additionally, understanding the evidence on black carbon can inform corporate sustainability reporting and stakeholder communication.

Companies in the built environment sector should consider how heating systems and construction activities contribute to local air quality. Switching from solid fuel heating, managing dust during construction, and selecting low-emission equipment can all reduce black carbon and other particulate emissions. These measures often align with emerging building standards and planning requirements.

For businesses with procurement responsibilities, particularly those supplying the public sector, awareness of air quality evidence can help anticipate future contract requirements. Government procurement is increasingly embedding environmental and health criteria, and black carbon may feature more prominently as evidence strengthens.

Where to find further information on black carbon and air quality

The World Health Organization provides comprehensive guidance on ambient air quality and health, including the health impacts of particulate matter and black carbon. The WHO air quality guidelines set out recommended limits for key pollutants based on current evidence.

The Climate and Clean Air Coalition offers detailed information on black carbon as a short-lived climate pollutant, including sources, impacts, and mitigation strategies. The coalition brings together governments, intergovernmental organisations, and non-state actors to reduce emissions.

UK businesses can consult the UK government’s air quality plan for information on domestic policy and regulatory developments. The plan addresses nitrogen dioxide alongside particulate matter and sets out the government’s approach to meeting legal limits.

For companies operating in urban areas, local authority clean air strategies provide detail on low-emission zones, vehicle restrictions, and other measures. Many cities publish air quality action plans that outline future policy direction. Therefore, businesses can use these documents to anticipate regulatory changes and plan accordingly.

The UK Air Information Resource managed by Defra offers air quality data, forecasts, and background information on pollutants. Businesses can use the site to monitor local air quality and understand exposure levels in areas where they operate.