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The mydata dataset is provided as an example dataset as part of the openair package. The dataset contains hourly measurements of air pollutant concentrations, wind speed and wind direction collected at the Marylebone (London) air quality monitoring supersite between 1st January 1998 and 23rd June 2005. The data set is a tibble.

Format

Data frame with 65533 observations (rows) on the following 10 variables:

list("date")

Observation date/time stamp in year-month-day hour:minute:second format (POSIXct).

list("ws")

Wind speed, in m/s, as numeric vector.

list("wd")

Wind direction, in degrees from North, as a numeric vector.

list("nox")

Oxides of nitrogen concentration, in ppb, as a numeric vector.

list("no2")

Nitrogen dioxide concentration, in ppb, as a numeric vector.

list("o3")

Ozone concentration, in ppb, as a numeric vector.

list("pm10")

Particulate PM10 fraction measurement, in ug/m3 (raw TEOM), as a numeric vector.

list("so2")

Sulfur dioxide concentration, in ppb, as a numeric vector.

list("co")

Carbon monoxide concentration, in ppm, as a numeric vector.

list("pm25")

Particulate PM2.5 fraction measurement, in ug/m3, as a numeric vector.

Source

mydata was compiled from data archived in the London Air Quality Archive. See https://www.londonair.org.uk for site details.

The same data is also provide in '.csv' format via the openair project web site https://davidcarslaw.github.io/openair/.

Details

mydata is supplied with the openair package as an example dataset for use with documented examples.

Note

openair functions generally require data frames with a field "date" that can be in either POSIXct or Date format but should be GMT time zone. This can be hourly data or higher resolution data.

Examples



#basic structure
head(mydata)
#> # A tibble: 6 × 10
#>   date                   ws    wd   nox   no2    o3  pm10   so2    co  pm25
#>   <dttm>              <dbl> <int> <int> <int> <int> <int> <dbl> <dbl> <int>
#> 1 1998-01-01 00:00:00  0.6    280   285    39     1    29  4.72  3.37    NA
#> 2 1998-01-01 01:00:00  2.16   230    NA    NA    NA    37 NA    NA       NA
#> 3 1998-01-01 02:00:00  2.76   190    NA    NA     3    34  6.83  9.60    NA
#> 4 1998-01-01 03:00:00  2.16   170   493    52     3    35  7.66 10.2     NA
#> 5 1998-01-01 04:00:00  2.4    180   468    78     2    34  8.07  8.91    NA
#> 6 1998-01-01 05:00:00  3      190   264    42     0    16  5.50  3.05    NA