Setting Status Indicators for your site

The overall air quality status (green, yellow, red) of a ground sensor or a site is determined based on the values of the individual metrics tracked at that location. If at least one metric is in the red range, then the status is red. If at least one metric is in the yellow range and none in the red range, then the status is yellow. And, finally, if all the metrics are in the green range, the overall status is green.

A satellite metric is in the green range if the most recently measured value is within one standard deviation of the mean; in the yellow range, if the most recently measured value is within one and two standard deviations of the mean; and in the red range if the most recently measured value is greater than two standard deviations from the mean.

A ground sensor metric is in the green range if the most recently measured hourly average is smaller than threshold1; in the yellow range if the most recently measured hourly average is between threshold1 and threshold2; and in the red range if the most recently measured hourly average is greater than threshold2. The values for threshold1 and threshold2 are listed below for each species: