• 1
  • 2
  • 3
  • low

Air quality is considered good and none of the pollutant concentrations exceed the short-term World Health Organization Air Quality Guidelines.

  • 4
  • 5
  • 6
  • moderate

Air quality is considered fair and some of the pollutant concentrations may exceed the short-term World Health Organization Air Quality Guidelines.

  • 7
  • 8
  • 9
  • high

Air quality is considered poor and at least one of the pollutant concentrations exceed the short-term
World Health Organization Air Quality Guidelines.

  • 10
  • 11
  • 12
  • very high

Air quality is considered very poor and some of the pollutant concentrations exceed the short-term
World Health Organization Air Quality Guidelines.

  • 12+
  • serious

Air quality is considered extremely poor and some of the pollutant concentrations exceed the short-term
World Health Organization Air Quality Guidelines.

  • NA
  • not available

Hedley Environmental Index is not calculated due to the missing data of some pollutants in the past three hours.


For more details, please refer to FAQ.

  • 1
  • 2
  • 3
  • low

The concentration is well below the short-term World Health Organization Air Quality Guidelines.

  • 4
  • 5
  • 6
  • moderate

The concentration is below the short-term World Health Organization Air Quality Guidelines.

  • 7
  • 8
  • 9
  • high

The concentration is above the short-term World Health Organization Air Quality Guidelines.

  • 10
  • 11
  • 12
  • very high

The concentration is largely above the short-term World Health Organization Air Quality Guidelines.

  • 12+
  • serious

The concentration is well above the short-term World Health Organization Air Quality Guidelines.

  • NA
  • Not Available

The concentration data is not available.


For more details, please refer to FAQ.