Folk who have the luxury of deciding where and when to go who take the air quality into account may be relieved to know that for the 30 days to 16th January 2012 the Upparat school in the centre of old Chiang Mai had the lowest average PM10 – fine particulate – readings in the 7 years of records to date.


  • SO2 หน่วย : ส่วนในพันล้านส่วน (ppb, 1/1,000,000,000)
  • NO2 หน่วย : ส่วนในพันล้านส่วน (ppb, 1/1,000,000,000)
  • CO หน่วย : ส่วนในล้านส่วน (ppm, 1/1,000,000)
  • Ozone หน่วย : ส่วนในพันล้านส่วน (ppb, 1/1,000,000,000)
  • PM10 หน่วย : ไมโครกรัมต่อลูกบาศก์เมตร (µg/m3)
  • AQIดัชนีคุณภาพอากาศ (Air Quality Index) ไม่ควรเกิน 100
    * :: ไม่มีค่ามาตรฐานเฉลี่ย 24 ชั่วโมง

These records may be viewed at the old PCD website . However data at this site ends at 31st January 2012 and for both current and earlier information we must now use the NEW Air Quality Monitoring  site. The list of pollutants monitored appears above and the colours indicate the level of danger according to the government standards which are well below UN recommended exposure levels. e.g. for PM10 the UN recommends 50 ppm the Thai government 120 ppm.

The new site has Thai names with English legends and figures are latinised arabic. The Upparat school station is No 36 , Chiang Mai Sala Glang No 35 & Lampang No 37.

There appear to be some teething problems and also the pollution meters we installed at are no longer functioning. Hopefully all will be running smoothly in the near future.