Air pollution data from Leeds (U.K.) city centre, collected from 1994
to 1998. The
summer data set corresponds to the months
of April to July inclusive. The
winter data set corresponds to the months
of November to February inclusive. Some outliers have been
removed, as discussed by Heffernan and Tawn, 2004.
Data frames with 578 (summer) and 532 (winter) observations on the following 5 variables.
Daily maximum ozone in parts per billion.
Daily maximum NO2 in parts per billion.
Daily maximum NO in parts per billion.
Daily maximum SO2 in parts per billion.
Daily maximum PM10 in micrograms/metre^3
Provided as online supplementary material to Heffernan and Tawn, 2004:
J. E. Heffernan and J. A. Tawn, A conditional approach for multivariate extreme values, Journal of the Royal Statistical society B, 66, 497 – 546, 2004
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