Not a good morning, Bangkok.

Only a few weeks since it last turned the sky into soup, heavy smog returned to the capital in force Wednesday.

Air quality had fallen to a very “unhealthy” score of 185 as of 10am, according to AirVisual, making Bangkok the fourth most-polluted city in the world, after Ulaanbaatar, Mongolia; Kolkata, India; and Dhaka, Bangladesh.

According to the Pollution Control Department, the smog will linger through Friday. Until then, everyone should mask up when they go outside.

The government blamed a high-pressure weather front and vehicle emissions. In October, transportation officials announced that they would strictly enforce vehicle emissions limits to cut the unhealthy smog.

Related:

Goodbye breeze, hello haze: Bangkok hails return of toxic smog

Thailand launches crackdown on emissions to cut smog

Choking on smog, Thais wonder why ‘Mr Google’ PM can’t solve it

Thai gov’t blames weather, vehicles for hazardous smog

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