Abstract
Mobile air pollution monitoring is an effective means of collecting spatially and temporally diverse air pollution samples. These observations are often used to predict long-term air pollution concentrations using temporal adjustments based on the time-series of a fixed location monitor. Temporal adjustments are required because the time-series is often incomplete at each spatial location. We describe a method-fusion temporal adjustment that has been demonstrated to improve the accuracy of long-term estimates from incomplete time-series data. Our adjustment approach combines the techniques of using a log transformation to modify the air pollution samples to a near normal distribution and incorporates the long-term median of a reference monitor to mediate the effects of estimate inflation created by outliers in the data. We demonstrate the approach with hourly Nitrogen Dioxide observations from Paris, France in 2016.Method-Fusion Benefits:•Log transformations control for estimate inflation created by log normally distributed data.•Adjusting data with the long-term median, rather than the mean, controls for estimate inflation.•Produces more accurate long-term estimates than other adjustments independent of the pollutant being estimated.
Highlights
Multiplicative temporal adjustments are used to correct for temporal trends present in air pollution data collected through short term monitoring campaigns [8]
Multiplicative temporal adjustments account for these trends by adjusting the short-term observations against continuous data observed at a fixed-location monitoring station
The method fusion approach can be applied to any mobile air pollution monitoring dataset and can produce more accurate long-term estimates compared to existing temporal adjustments
Summary
Adjusting data with the long-term median, rather than the mean, controls for estimate inflation. The data collected from the short-term monitoring campaigns have been used to estimate long-term concentrations and develop predictive models of air pollution. Aside from calculating the raw average of short-term samples and treating these values as the long-term concentration estimate, multiplicative temporal adjustments are often employed to predict long-term exposure estimates [5,6,7].
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