On Monday, readings for PM2.5 (particles less than 2.5 micrometres in diameter) were in the range of 21 to 61 micrograms per cubic metre (&mu;g/m3) of air.

The World Health Organisation sets the safe level of PM2.5 at no more than 25&mu;g/m3, though Thailand sets the level at 50&mu;g/m3.

Despite there being an improvement in the rest of the city, air quality hit unsafe levels in two districts, namely Nong Khaem (61&mu;g/m3) and Thawee Watthana (53&mu;g/m3).

The PM2.5 situation can be followed on&nbsp;<a href="http://air4thai.com/webV3/#/Home">Air4Thai.com</a>&nbsp;and&nbsp;<a href="http://bangkokairquality.com/bma/index.php">bangkokairquality.com</a>&nbsp;websites, CAPM Facebook page, or via Air4Thai and AirBKK smartphone applications.

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Air in most of Greater Bangkok improves

The quality of air in Bangkok and adjacent provinces improved on Monday after many areas hit unsafe levels last week.