The dataset contains 590 (transformed) daily maxima of five
air pollutants (respectively PM10, NO, NO2, 03 and S02) recorded in Leeds (U.K.) during five winter
seasons (November-Februrary) between 1994 and 1998. Contains
Outliers have been removed according to Heffernan and Tawn (2004).
A 590*5 matrix.
Heffernan, J. E., and Tawn, J. A. (2004). A conditional approach for multivariate extreme values. Journal of the Royal Statistical Society, Series B, Methodology, 66, 497–546