calcFno2(input, tau = 60, user.fno2, main = "", xlab = "year", ...)nox
andno2 (roadside NOX and NO2 concentrations), back_nox,
back_no2 and back_o3 (hourly background concentrations of
each pollutant). In addition scatterPlot.calcFno2 also returns
an object of class ``openair''. The object includes three main
components: call, the command used to generate the plot;
data, the data frame of summarised information used to make the
plot; and plot, the plot itself. If retained, e.g. using
output <- calcFno2(...), this output can be used to recover the
data, reproduce or rework the original plot or undertake further
analysis.
An openair output can be manipulated using a number of generic operations,
including print, plot and summary.linearRelation
for details of how to estimate the primary NO2 fraction.
In the absence of roadside O3 measurements, it is rather more problematic
to calculate the fraction of primary NO2. Carslaw and Beevers (2005c)
developed an approach based on linearRelation the analysis of
roadside and background measurements. The increment in roadside NO2
concentrations is primarily determined by direct emissions of NO2 and the
availability of One to react with NO to form NO2. The method aims to
quantify the amount of NO2 formed through these two processes by seeking
the optimum level of primary NO2 that gives the least error.
Test data is provided at linearRelation if you have roadside ozone
measurements.## Users should see the full openair manual for examples of how
## to use this function.Run the code above in your browser using DataLab