Tackling air pollution at a global scale

Air pollution has no respect for borders. Regional agreements can only go so far. The needs a global agreement.
In the 1960s, scientists across Europe began to notice that the rain was unusually acidic, denuding forests and poisoning lakes. They traced the problem to the sulphur-dioxide emissions from coal-fired power plants. And not just their own – for example, sulphur emissions from the UK were causing the forests in Scandinavia to suffer.By 1979, the United Nations Economic Commission for Europe (UNECE) had established a landmark Convention on Long-range Transboundary Air Pollution to reduce the toxic emissions. It's been a slow-moving agreement – it took four years just to be ratified – but over the last 40 years sulphur-dioxide emissions have dramatically fallen. And the agreement's journey is far from over. With a new taskforce on air pollution set to meet for the first time in October, the lessons from Europe can show the way to a global convention on air pollution.All pollution can be transboundary. Whether it's plastic particles in the ocean or nitrogen run-off from farming, pollution has no respect for sovereign borders. Even Australia, with its continental mass and vast surrounding oceans, contributed to global air pollution as a result of the 2019–20 ‘Black Summer' bushfire emergency.
The global focus of air pollution has shifted from Europe in the late 20th century to Asia. Even as Europe cleaned up its industry, it shifted the production of goods to cheaper labour markets. Asia is now the hotspot for air-pollution emissions.When ranked according to the pollution from fine soot particles, six of the top 10 cities are in Asia. Nearly 60 percent of all deaths globally attributable to fine particle pollution occurred in and China.Air pollution typically consists of oxides of nitrogen and sulphur, plus fine particulate matter, ozone, ammonia, heavy metals, volatile organic compounds, and persistent organic pollutants. Fine particulate matter has been the most studied air pollutant and is linked to a number of problems, including preterm births, loss of cognitive function, lung cancer, stroke and heart disease, asthma and diabetes.
A pressing problem in Southeast Asia is the smoke haze from . Land for farming is often cleared using slash-and-burn practices, and crop residues are burned to clear the way for next year's crop. This is a particular problem in Indonesian Kalimantan and Sumatra, where large tracts of land are cleared for palm-oil and timber plantations. Indonesia experienced major forest fires in 1997, 2015 and 2019, with the smoke blanketing neighbouring countries for weeks.As a response to the Indonesian forest fires, the Association of Southeast Asian Nations (ASEAN) drafted a multilateral agreement on transboundary smoke haze in 2002. It entered into force in 2003 and Indonesia was the last to ratify it, in 2015. The agreement built upon earlier, smaller agreements on smoke But such haze is just one example of air pollution. Even with the agreement in place, transboundary air pollution will continue to be a problem in Southeast Asia, and in Asia more generally, until the world agrees to collectively address the problem. Air pollution from China, India, the Middle East and Africa can, and will, affect people living in Asia.