ozone.NY: New York ozone concentration levels

In EnviroStat: Statistical Analysis of Environmental Space-Time Processes

Description

The ozone.NY data frame consists of hourly O_3 concentration levels (ppb) from nine stations in New York State numbered for our purposes from 1 to 9. These data were originally downloaded from the EPA's AIRS air quality site (Environmental Protection Agency 2013). Furthermore, preliminay analysis suggested a sqrt transformation of the original concentrations to symmetrize the data distribution.

Usage

data(ozone.NY)

Format

Each row of the data set represents a daily record starting at April 1, 1995, and ending at September 30, 1995 (183 days). Measurements are recorded by station in columns, with four columns per station (for hours 8–12); there are nine stations, so there are 36 columns of measurements in total.

The last six stations have no missing observations while stations 1, 2, 3 have 2616, 2016, and 72 missing hourly observations, respectively.

month

month of the measurement, numeric 4–9

weekday

day of the week, numeric 2–8

sqO3.1–sqO3.4

square root of the O_3 measurement for station 1 for hours 8–12 (8am to noon).

…

sqO3.33–sqO3.36

square root of the O_3 measurement for station 9 for hours 8–12 (8am to noon).

Source

US Environmental Protection Agency's AIRS air quality site (2013), http://www.epa.gov/ttn/airs/airsaqs/.

EnviroStat documentation built on May 2, 2019, 2:32 p.m.