calcFno2(input, tau = 60, user.fno2, main = "",
xlab = "year", ...)nox andno2 (roadside NOX and NO2
concentrations), backnox, backno2 and
backo3 (hourly background concentrations of each
pollutant). In addscatterPlot.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. See openair.generics
for further details.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