Governments, industries, and cities around the world are tackling air pollution through a combination of stricter regulations, cleaner technology, and redesigned urban spaces. The efforts span nearly every sector that contributes to dirty air, from transportation and power generation to shipping and agriculture. Some of these measures are already producing measurable results, while others are scaling up quickly.
Tighter Global Air Quality Standards
The World Health Organization updated its global air quality guidelines in 2021, cutting recommended limits roughly in half compared to the previous 2005 standards. The new targets call for annual average fine particulate matter (the tiny particles that penetrate deep into your lungs) not to exceed 5 micrograms per cubic meter, down from 10. The limit for nitrogen dioxide, a gas produced mainly by burning fossil fuels, dropped from 40 to just 10 micrograms per cubic meter. A new recommendation for long-term ozone exposure was added for the first time, set at 60 micrograms per cubic meter during peak season.
These guidelines aren’t legally binding, but they serve as a benchmark that countries use when writing their own laws. The tighter numbers reflect years of research showing that air pollution causes serious health damage at levels previously considered safe. Many countries, particularly in South Asia, Africa, and parts of Latin America, still have pollution levels several times above even the older, more lenient standards, so the updated guidelines are pushing policymakers to act more aggressively.
The Electric Vehicle Surge
Transportation is one of the largest sources of urban air pollution, and the shift to electric vehicles is accelerating faster than most projections anticipated. Global electric car sales exceeded 17 million in 2024, meaning more than one in five new cars sold worldwide was electric. China is leading the charge: nearly half of all cars sold there were electric in 2024, and on a monthly basis, electric car sales actually overtook conventional car sales starting in July of that year. About one in five new cars sold in Europe was electric, while the U.S. reached a 10% share with 1.6 million electric cars sold.
The trend is spreading beyond major markets. In Thailand, electric vehicles captured 13% of sales. Turkey reached 10% after ramping up domestic production. Costa Rica hit around 15%, and Colombia reached 7.5%. Even in emerging economies across Asia, Latin America, and Africa, electric car sales jumped over 60% year-on-year in 2024, though the overall share in Africa remains under 1%.
Projections for 2025 suggest electric car sales will surpass 20 million globally, representing a quarter of all new car sales. China’s share is expected to reach around 60%, and Europe could see its electric share climb to roughly 25%. Each electric vehicle that replaces a gasoline or diesel car eliminates tailpipe emissions of nitrogen oxides, particulate matter, and volatile organic compounds in the neighborhoods where people actually breathe.
Low Emission Zones in Cities
Hundreds of cities have created low emission zones that restrict or charge the most polluting vehicles. London’s Ultra Low Emission Zone is the strictest policy of its kind globally, and research from the University of Bath found it reduced nitrogen dioxide levels by 21% and coarse particulate matter by 15% in Central London compared to areas outside Greater London. These are substantial drops that translate directly into fewer asthma attacks, fewer hospital admissions, and fewer premature deaths.
Similar zones operate in cities across Europe, including Paris, Berlin, Brussels, and Milan. Some cities are going further by banning diesel vehicles entirely from city centers or converting bus fleets to electric. The common thread is using policy to remove the dirtiest vehicles from the places where people are most exposed to exhaust fumes.
Cleaning Up Shipping
Ocean shipping burns some of the dirtiest fuel on the planet and has historically been one of the largest sources of sulfur oxide emissions. In 2020, the International Maritime Organization enforced a global cap that slashed the allowable sulfur content in marine fuel from 3.5% to 0.5%. This single regulation was forecast to cut overall sulfur oxide emissions from ships by 77%, a reduction equivalent to 8.5 million metric tonnes of sulfur oxides removed from the air each year. Sulfur oxides contribute to acid rain and form fine particles that damage lungs, so this was one of the most impactful single pollution rules ever enacted.
Carbon Capture for Heavy Industry
Some industries, like cement and steel production, can’t easily switch to clean electricity because their processes inherently release carbon dioxide and other pollutants. Carbon capture technology offers a partial solution by trapping emissions before they leave the smokestack. Modern facilities designed for coal and natural gas power plants can capture 90% of the carbon dioxide they produce. A lower-cost option captures about 36% of emissions, giving operators a stepping stone while the technology matures.
The challenge is cost and scale. Carbon capture works, but it requires significant energy to run and expensive infrastructure to transport and store the captured carbon dioxide underground. It’s best understood as a tool for industries that have no other path to clean operation, not as a replacement for switching to renewable energy where that’s possible.
Green Hydrogen as a Clean Fuel
Hydrogen made using renewable electricity, known as green hydrogen, produces zero air pollution when used as fuel. It could replace fossil fuels in sectors that are hard to electrify, like long-haul trucking, steel manufacturing, and chemical production. The obstacle right now is price: green hydrogen costs between $3.50 and $6.00 per kilogram to produce, compared to $1.50 to $2.50 for hydrogen made from natural gas. That natural gas method, however, generates 9 to 20 kilograms of carbon dioxide for every kilogram of hydrogen produced.
Government incentives are closing the gap. The U.S. Inflation Reduction Act offers tax credits of up to $3.00 per kilogram, which would make green hydrogen cost-competitive almost immediately in some cases. As renewable electricity gets cheaper and the equipment used to split water into hydrogen becomes more efficient, production costs are expected to continue falling.
Reducing Methane From Agriculture
Livestock farming is a major source of methane, a potent greenhouse gas that also contributes to ground-level ozone formation. Researchers at UC Davis found that feeding grazing beef cattle a seaweed-based pellet supplement reduced their methane emissions by almost 40% without affecting the animals’ health or weight gain. Earlier studies in more controlled environments showed even bigger reductions: 82% in feedlot cattle and over 50% in dairy cows.
Scaling this approach to the world’s roughly one billion cattle is a logistical challenge, but the science is clear. Several companies are now producing seaweed-based feed additives commercially, and some countries are beginning to incorporate methane reduction targets into their agricultural policies.
Renewable Energy Replacing Fossil Fuels
The most fundamental strategy for reducing air pollution is generating electricity without burning anything. Solar and wind power now account for a rapidly growing share of new electricity generation worldwide, and in many regions they are already cheaper than building new coal or gas plants. Coal-fired power plants are the single largest industrial source of sulfur dioxide, nitrogen oxides, mercury, and fine particulate matter, so every coal plant that closes permanently removes a significant pollution source from the air.
Countries are moving at different speeds. The United Kingdom went from generating 40% of its electricity from coal in 2012 to closing its last coal plant in 2024. China, while still the world’s largest coal consumer, is also installing more solar capacity each year than any other country. India has set aggressive renewable energy targets. The transition is uneven, but the direction is consistent across nearly every major economy.