Thailand’s parliament has resurrected long-postponed legislation that would recognise clean air as a public right and create a coordinated national framework to tackle seasonal smog.
Last week the House of Representatives voted 611–3 to advance the Clean Air Act. The bill now moves to the Senate for review before it can be sent for the prime minister’s and the king’s endorsement.
The proposal began as citizen-initiated legislation put forward by a coalition of NGOs in 2019. Multiple draft versions — seven in total — were eventually merged into a single consolidated bill that has since been adopted by political parties and successive administrations.
Key measures in the bill would make major emitters in industry, transport and agriculture financially accountable through fees, fines or compensation for pollution damage. It also aims to trace supply chains, including agricultural imports, to prevent products linked to open burning or cross-border haze from avoiding scrutiny.
Currently, air pollution in Thailand is regulated by a fragmented set of laws. The Clean Air Bill seeks to harmonise those rules, give local authorities clearer powers to respond to pollution in their areas, and establish unified systems for monitoring and enforcement.
Thailand’s smog problem is acute in the dry season, especially from December through April, when agricultural burning, forest fires, traffic and industrial emissions combine with stagnant weather conditions. PM2.5 — fine particulate matter small enough to pass from the lungs into the bloodstream — is the primary health concern.
Environmental reporting indicates that about 10 million people sought medical care for pollution-related illnesses in 2023. The World Health Organization estimates air pollution contributes to more than 32,000 premature deaths in Thailand each year, affecting both heart and lung health.
What the law proposes
The bill introduces several progressive policy tools. It would require authorities to reallocate budgets to support clean-air management and to collect pollution taxes. The law enables local ordinances, the designation of pollution control zones, and area-specific air quality standards.
It also calls for stronger air-quality monitoring systems, integration of pollution data across government agencies, and new powers for local governments to act when pollution exceeds safe levels. Measures target open burning, tighter regulation of high-emitting sectors and provisions that address transboundary pollution originating outside Thailand.
A Clean Air Fund envisaged by the bill would finance pollution reduction efforts, public-health responses, and assistance to farmers transitioning away from burning. The bill promotes evidence-based approaches by encouraging the use of technology, innovation and public data. Citizen monitoring, local watchdog networks and community sensors would gain formal recognition within the clean-air framework.
Political test and objections
The Clean Air Bill nearly became law after a consolidated version passed the House in October 2025 and entered advanced scrutiny in the Senate before parliament was dissolved in December. Prime Minister Anutin Charnvirakul’s government, which took office in April, had a short window to resume unfinished bills from the previous legislature.
Some members of Anutin’s Bhumjaithai Party have opposed the legislation, arguing it could impose new costs on businesses and duplicate existing statutes. During a parliamentary debate, Bhumjaithai lawmaker Supachai Jaisamut said he agreed with the bill’s goals but objected to broad powers for officials that, he warned, could allow searches, seizures, asset freezes and business shutdowns without court warrants.
Business groups and conservative lawmakers have cautioned that pollution fees, clean-air levies and risk-guarantee mechanisms could increase operating costs at a difficult economic juncture. Thailand’s 2026 growth outlook is modest — the World Bank projected growth of about 1.6% — and rising energy costs have added pressure.
In mid-April Prime Minister Anutin publicly pledged tougher action on wildfires and PM2.5 smog and voiced support for the Clean Air Bill, including potential restrictions on imports of farm products linked to burning in neighbouring countries. His government reintroduced the bill, prompting the recent House vote.
Analysts expect the Senate to seek revisions. “A likely scenario is that the Senate will call for revisions, citing concerns such as overlapping laws, burdens on the business sector and the scope of authority of government agencies,” said Piyapong Boossabong, associate professor at Chiang Mai University’s School of Public Policy. “The bill may not be finalised as quickly as many parties had hoped.”
Enforcement challenges
Whether the law will be effectively enforced remains a central question. Thailand has enacted progressive environmental laws in the past that were not consistently implemented, experts note.
The country’s largest clean-air challenge is PM2.5 generated by agricultural burning and forest fires conducted by individual farmers and communities. Successive governments have struggled to enforce bans on burning, in part because burning crop stubble is closely tied to rural livelihoods and entrenched agribusiness supply chains.
“Thailand’s regulatory system cannot rely solely on self-enforcement of pollution standards, and it remains to be seen if the Anutin government is actually serious about enforcement of a potential clean air mechanism,” said Mark Cogan, a regional expert and associate professor at Kansai Gaidai University.
The “polluter pays” principle is common in many developed economies and appears straightforward in principle, but weak enforcement and difficulties identifying polluters have limited accountability in some nearby states. Cogan suggested that additional mechanisms might be needed, such as placing part of the liability on government where polluters are hard to identify.
Geography complicates enforcement: the bill can only be applied inside Thailand, while much of the haze affecting the north drifts in from neighbouring countries. Based on hotspot data, Piyapong Boossabong estimated the Clean Air Bill may be able to reduce only about 30% of Thailand’s overall air pollution.
The bill’s passage through the Senate, the scope of any amendments, and the authorities’ willingness and capacity to enforce new measures will determine whether the legislation leads to meaningful improvements in air quality. For now, the revived Clean Air Act remains a political and technical test of Thailand’s ability to translate legal reform into cleaner air and better public health.
Edited by Wesley Rahn