This is a UK Natural Environment Research Council (NERC) funded knowledge exchange project that aims to make available innovative analysis tools for air pollution data; with additional support from Defra. The tools have generally been developed to analyse data of hourly resolution (or at least a regular time series) both for air pollution monitoring and dispersion modelling. The availability of meteorological data at the same time resolution greatly enhances the capabilities of these tools.

## Details

openair contains collection of functions to analyse air pollution data. Typically it is expected that data are hourly means, although most functions consider other time periods. The principal aim to make available analysis techniques that most users of air quality data and model output would not normally have access to. The functions consist of those developed by the authors and a growing number from other researchers.

The package also provides access to a wide range of data sources including the UK Automatic Urban and Rural Network (AURN), networks run by King's College London (e.g. the LAQN) and the Scottish Air Quality Network (SAQN).

The package has a number of requirements for input data and these are discussed in the manual (available on the openair website at https://davidcarslaw.github.io/openair/). The key requirements are that a date or date-time field must have the name date' (and can be Date or POSIXct format), that wind speed is represented as ws' and that wind direction is wd'.

Most functions work in a very straightforward way, but offer many options for finer control and perhaps more in-depth analysis.

The openair package depends on several other packages written by other people to function properly.

To ensure that these other packages are available, they need to be installed, and this requires a connection to the internet. Other packages required come with the R base system. If there are problems with the automatic download of these packages, see https://davidcarslaw.github.io/openair/ for more details.

NOTE: openair assumes that data are not expressed in local time where 'Daylight Saving Time' is used. All functions check that this is the case and issue a warning if TRUE. It is recommended that data are expressed in UTC/GMT (or a fixed offset from) to avoid potential problems with R and openair functions. The openair manual provides advice on these issues (available on the website).

To check to see if openair has been correctly installed, try some of the examples below.

## References

Most reference details are given under the specific functions. The principal reference is below but users may also wish to cite the manual (details for doing this are contained in the manual itself).

Carslaw, D.C. and K. Ropkins, (2012) openair --- an R package for air quality data analysis. Environmental Modelling & Software. Volume 27-28, 52-61.

See https://davidcarslaw.github.io/openair/ for up to date information on the project.

## Author

David Carslaw with initial support from Karl Ropkins

## Examples

# load example data from package
data(mydata)

# summarise the data in a compact way
if (FALSE) summaryPlot(mydata)

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