"Such measures should be put in place between January and the end of March, when air pollution is expected to reach a new high," Mr Supat said. PM2.5 levels in Bangkok spiked this month, tearing past 50 µcg per cubic metre and peaking at nearly 100 µcg on some days. Euro 5 introduced particulate filters (DPFs) for diesel vehicles, which capture 99% of particulate matter, along with lower limits across the board. Euro 6 cut the permitted level of NOx for diesels from 0.18g/km in Euro 5 to 0.08g/km, among other changes. Thailand has reduced air pollution in the past by using more environmental friendly fuel specifications.

Source: Bangkok Post February 20, 2018 21:33 UTC