.BG D
.FN ozone
.TL
Ozone Concentrations in North-East U.S.
.PP
.AG median
median of daily maxima ozone concentration for
June-August, 1974.  Concentrations in parts per billion (ppb).
.AG quartile
upper quartile of daily maxima ozone concentration,
in parts per billion (ppb).
.AG city
character name of ozone monitoring site.
.AG xy
list containing components named `x' and `y', that give
the negative longitude and latitude of the monitoring sites
(in the coordinate system used by function `usa').
.SH SOURCE
W. S. Cleveland,  B. Kleiner, J. E. McRae,  J. L. Warner, 
and R. E. Pasceri, "The Analysis of
Ground-Level Ozone Data from New Jersey, New York, Connecticut, and
Massachusetts: Data Quality Assessment and Temporal and Geographical
Properties", Bell Laboratories Memorandum, July 17, 1975.
.PP
Original data collected by
New Jersey Department of Environmental Protection,
New York State Department of Environmental Protection,
Boyce Thompson Institute (Yonkers, NY data),
Connecticut Department of Environmental Protection,
and
Massachusetts Department of Public Health.
.KW dataset
.WR
