Ozone Concentrations in the Northeast U.S.
Ozone concentrations in 41 U.S. cities based on daily maxima collected between June and August 1974.
Ozone.NE.df
A data frame with 41 observations on the following 5 variables.
Medianmedian of daily maxima ozone concentration (ppb).
QuartileUpper quartile (i.e., 75th percentile) of daily maxima ozone concentration (ppb).
Citya factor indicating the city
Longitudenegative longitude of the city
Latitudelatitude of the city
Cleveland, W.S., Kleiner, B., McRae, J.E., Warner, J.L., and Pasceri, P.E. (1975). 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.
The original data were collected by the New Jersey Department of Environmental Protection, the New York State Department of Environmental Protection, the Boyce Thompson Institute (Yonkers, for New York data), the Connecticut Department of Environmental Protection, and the Massachusetts Department of Public Health.
summary(Ozone.NE.df) # Median Quartile City Longitude # Min. : 34.00 Min. : 48.00 Asbury Park: 1 Min. :-74.71 # 1st Qu.: 58.00 1st Qu.: 79.75 Babylon : 1 1st Qu.:-73.74 # Median : 65.00 Median : 90.00 Bayonne : 1 Median :-73.17 # Mean : 68.15 Mean : 95.10 Boston : 1 Mean :-72.94 # 3rd Qu.: 80.00 3rd Qu.:112.25 Bridgeport : 1 3rd Qu.:-72.08 # Max. :100.00 Max. :145.00 Cambridge : 1 Max. :-71.05 # NA's : 1.00 (Other) :35 # Latitude # Min. :40.22 # 1st Qu.:40.97 # Median :41.56 # Mean :41.60 # 3rd Qu.:42.25 # Max. :43.32
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