Footage shows the thick cloud of PM2.5 pollution engulfing Bangkok this morning (February 3).

The capital of Thailand has been choked by the toxic smog for several weeks - sparking heat warnings from the country's officials.

Today, the AQI index showing the levels of air safety hit 175 in Bangkok ,far higher than the safe levels of 50 and classed as 'very unhealthy'.

Smogs is at its worst between January and March when farmers burn crops as it is combined with dry, stagnant weather and a winter low pressure system in which cold air is trapped closer to the ground by warm air above - preventing the pollution from being dispersed naturally.

The Thai government has been criticised for its handling of the country's air pollution crisis. Measures introduced last year to reduce pollution included spraying water into the air to increase humidity, which helps to absorb particles of pollution.

''Unfortunately, this mitigation does not appear to be effective, since the volume of water is minuscule compared to actual rain,'' wrote data scientist engineer Worasom Kundhikanjana.

Footage shows the thick cloud of PM2.5 pollution engulfing Bangkok this morning February 3.

The capital of Thailand has been choked by the toxic smog for several weeks - sparking heat warnings from the country's officials.

Today, the AQI index showing the levels of air safety hit 175 in Bangkok ,far higher than the safe levels of 50 and classed as 'very unhealthy'.

Smogs is at its worst between January and March when farmers burn crops as it is combined with dry, stagnant weather and a winter low pressure system in which cold air is trapped closer to the ground by warm air above - preventing the pollution from being dispersed naturally.

The Thai government has been criticised for its handling of the country's air pollution crisis. Measures introduced last year to reduce pollution included spraying water into the air to increase humidity, which helps to absorb particles of pollution.

''Unfortunately, this mitigation does not appear to be effective, since the volume of water is minuscule compared to actual rain,'' wrote data scientist engineer Worasom Kundhikanjana.