PM2.5 dust in the atmosphere in most areas of the north and north-east today (Tuesday) has exceeded the national safety level, according to the Centre for Air Pollution Mitigation.

The centre has advised people living in those areas to reduce their outdoor activities and to wear face masks if necessary.

Provinces in the north and north-east with excessive levels of PM2.5 today are Chiang Rai, Chiang Mai, Nan, Mae Hong Son, Phayao, Lamphun, Lampang, Phrae, Uttaradit, Sukhothai, Tak, Phitsanuloke, Kamphaeng Phet, Nong Khai, Loei, Udon Thani, Nakhon Phanom, Nong Bua Lamphu, Sakhon Nakhon, Mukdahan, Khon Kaen, Chaiyaphum and Ubon Ratchathani.

PM2.5 levels in the northern provinces range from 30 to 195 microns, against the safety standard of 50 microns, while levels in north-eastern provinces range from 38-112 microns.

In Bangkok and its suburbs, PM2.5 levels today range from 12-61 microns.

For the rest of the country, the air quality is good, with the amount of PM2.5 being under 38 microns.

Meanwhile, the Pollution Control Department has forecast that air quality in Bangkok and its suburbs tomorrow and Thursday will improve, due to the windy conditions. From Friday onward more PM2.5 dust can be expected.