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#' Example data for trajectory mapping functions
#'
#' The `traj_data` dataset is provided as an example dataset as part of the
#' `openairmaps` package. The dataset contains HYSPLIT back trajectory data for
#' air mass parcels arriving in London in 2009. It has been joined with air
#' quality pollutant concentrations from the "London N. Kensington" AURN urban
#' background monitoring site.
#'
#' `traj_data` is supplied with the `openairmaps` package as an example dataset
#' for use with documented examples.
#'
#' @format A data frame with 53940 rows and 10 variables:
#' \describe{
#' \item{date}{The arrival time of the air-mass}
#' \item{receptor}{The receptor number}
#' \item{year}{Trajectory year}
#' \item{month}{Trajectory month}
#' \item{day}{Trajectory day}
#' \item{hour}{Trajectory hour}
#' \item{hour.inc}{Trajectory hour offset from the arrival date}
#' \item{lat}{Latitude}
#' \item{lon}{Longitude}
#' \item{height}{Height of trajectory in m}
#' \item{pressure}{Pressure of the trajectory in Pa}
#' \item{date2}{Date of the trajectory}
#' \item{nox}{Concentration of oxides of nitrogen (NO + NO2)}
#' \item{no2}{Concentration of nitrogen dioxide (NO2)}
#' \item{o3}{Concentration of ozone (O3)}
#' \item{pm10}{Concentration of particulates (PM10)}
#' \item{pm2.5}{Concentration of fine particulates (PM2.5)}
#' }
#' @source `traj_data` was compiled from data using the [openair::importTraj()]
#' function from the `openair` package with air quality data from
#' [openair::importAURN()] function.
#'
#' @keywords datasets
#' @examples
#'
#' # basic structure
#' head(traj_data)
"traj_data"
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