Welcome to the AirNet Sensor Data Quality Validation service.
Station: Los Altos, United States of America also known as "Purple Air 78623" located at "Costello Dr, Los Altos, Santa Clara County, California, 94024, USA".Explanations
On the first graph below (labeled "data readings confidence zone"), the red line represents the hourly readings from the sensor, while the green line represents the median of the hourly readings of the station neighbors.
The zone filled in green represents the confidence zone, equivalent to 3 times the standard deviation of the neighbor stations.
Each time the station hourly reading goes above the confidence zone, the station is considered producing abnormal reading.
The larger the difference between the hourly reading and confidence zone, the more likely the station is considered as producing invalid data.
The formula is defined as:
P=probability, D=distance and W=P*D
where 'i' is iterated over the past 3 days data and 'n' is the number of samples during those past 3 days (most likely n = 24*3).
If W>30, the station is automatically disabled.
Show me the data
Further questions
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