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Bangkok Enforces Stricter Diesel Smoke Limit from 1 November

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Pictures courtesy of The Nation

 

Bangkok is implementing a tougher standard on diesel vehicle emissions starting November 1, 2025, in a bid to curb PM2.5 pollution. The Bangkok Metropolitan Administration (BMA) has announced that the maximum permitted exhaust smoke opacity for diesel engines will be reduced from 30% to 20%. The move, formalised in the Royal Gazette, marks a major tightening of air quality regulations in the capital.

 

The BMA’s Environment Department said the measure is essential to address vehicle-related air pollution, one of Bangkok’s most persistent environmental problems. Older diesel vehicles, particularly those with pre-Euro 5 engines, are among the worst emitters of fine dust caused by incomplete fuel combustion. Officials said the lower opacity threshold will help cut PM2.5 emissions and improve overall air quality.

 

Under the new rule, any diesel vehicle emitting smoke above the 20% limit will face strict penalties. Violating vehicles will be immediately tagged with a ‘Temporary Ban on Use’ sticker, requiring owners to fix the issue within 30 days in compliance with the National Environmental Quality Promotion and Maintenance Act B.E. 2535 (1992). In addition, offenders may be fined up to 4,000 baht under the Land Traffic Act B.E. 2522 (1979).

 

The BMA said enforcement teams will conduct roadside inspections and collaborate with relevant agencies to ensure compliance citywide. To assist motorists, the BMA has also issued practical maintenance advice aimed at helping diesel owners meet the new standards. 

 

Drivers are urged to maintain their fuel systems, clean exhaust pipes, change engine oil and filters on schedule and replace air filters regularly. Ensuring that engines are properly serviced will help reduce emissions and avoid penalties.

 

Officials emphasised that the new regulation represents part of a broader campaign to tackle PM2.5 pollution, which poses serious health risks during Bangkok’s annual smog season. The city’s authorities have pledged to continue tightening emission standards and encouraging cleaner vehicle technologies in the coming years.

 

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Key Takeaways

 

• Bangkok cuts diesel exhaust opacity limit from 30% to 20% starting November 1, 2025.

• Offenders face up to a 4,000-baht fine and a 30-day vehicle ban for violations.

• The BMA urges motorists to maintain engines and exhaust systems to meet the new rule.

 

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image.png  Adapted  by  Asean  Now from Nation 2025-11-03

 

 

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  • Popular Post

Stricter smoke limit from 1 November to 8 November, than back as usual... Drive on Phetkasem Road to Prachuap Kiri Kan and see how many trucks and cars have black smoke...

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Be back to normal a week latter.

Just more BS from the BS factory of Asia.

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Another recycled idea 

17 hours ago, Georgealbert said:

Bangkok cuts diesel exhaust opacity limit from 30% to 20%

So reduce air pollution to 20% is hardly an emission reduction.

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Only in Bangkok? Nationwide please!!

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16 hours ago, ikke1959 said:

Stricter smoke limit from 1 November to 8 November, than back as usual... Drive on Phetkasem Road to Prachuap Kiri Kan and see how many trucks and cars have black smoke...

If they enforced this across all vehicles 25% would be off the road... it ain't going to happen

Are the new diesel engines in Thailand with a catalytic converter ?

Looking at the car websites I see no mention.

Well it will increase the envelope rate for a week at least. Can’t say much else will be done. A week, Really. 

These pesty buses again - remember identical headlines 10, 20, 30 and 40 years ago already. It seems that the BMA is really, really, really busy in getting this under control - for decades! 

Annual smog season. What does it mean? Something to do with burning? If so address that. Yeah the government buses contribute a lot. How many smoke measuring devices are available to test vehicles? A small handful? This type of announcements are mostly to bolster government staff resumes. 

Why only Bangkok? Where I live many of the old Datsun pickups are belching smoke at 100% opacity!

1 hour ago, Luuk Chaai said:

I'm sure we will all be "Holding our Breath !"

Not too long, Luuk.

I still like to live here.

Ban everything and everyone who smokes or creates smoke. It is a killer.

On 11/3/2025 at 4:00 PM, ikke1959 said:

Drive on Phetkasem Road to Prachuap Kiri Kan and see how many trucks and cars have black smoke...

What can BMA, Bangkok, do about that?

This is hilarious. 2 of the pictures are of BMA buses that are old and smoking. Clean up your own backyard BMA

13 hours ago, FlorC said:

Are the new diesel engines in Thailand with a catalytic converter ?

Looking at the car websites I see no mention.

Catalytic converters have been mandatory in Thailand for many years.

12 hours ago, Sydebolle said:

These pesty buses again - remember identical headlines 10, 20, 30 and 40 years ago already. It seems that the BMA is really, really, really busy in getting this under control - for decades! 

Indeed, it has, the majority of buses in BMA's jurisdiction have been LPG-fuelled for years

11 hours ago, AustinRacing said:

government buses contribute a lot.

Vast majority of which are fuelled by LPG, not diesel.

6 minutes ago, Beerzy65 said:

This is hilarious. 2 of the pictures are of BMA buses that are old and smoking. Clean up your own backyard BMA

That's what they are doing, and have been for years, very few Bangkok buses use diesel.

They will assign the forest and farmland fire prevention and  ire ban enforcement team to this and it will be a  success!!!!

10 hours ago, Liverpool Lou said:

Catalytic converters have been mandatory in Thailand for many years.

Thanks , I didn't know.

They are expensive and need to be replaced after a number of years.

Maybe not in Thailand.

Anyone know the smoke opacity percentage of their vehicles? Are we talking idle or under load? While it's good that the law is trying to reduce pollution, I doubt the poorer in society will be able to adhere to this. 

Why such a short period of time is it because certain alleged people want to be seen to be doing something but in reality don't care

Yet we just got done with the Impact Speedfest (Drifting Competition) here in Nonthaburi, where modified cars were spewing toxic smoke into the air for several days, and burning rubber tires up. They put enough toxic smoke into the air in a week during this competition to equal all the public cars on the roads here in Bangkok for a year. But they're concerned about PM2.5?! Yeah, RIGHT!!! 

On 11/4/2025 at 10:58 PM, Liverpool Lou said:

Catalytic converters have been mandatory in Thailand for many years.

is AdBlue a thing yet ?

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