VGAMextra (version 0.0-6)

ap.mx: Air pollution Data, Mexico City.

Description

Daily air pollution levels in Mexico City, January 2004 -- June 2005.

Usage

data(ap.mx)

Format

This data frame stores time series vectors with the following information:

time

Time vector.

PM10

24--hr average concentration of \(PM_{10}\), in micrograms per milliliter.

O3

Daily maximum 8--hour moving average of ozone, in micrograms per milliliter.

temp

Daily mean average of temperature, in celsius degrees.

HR

Daily mean average (%) of relative humidity.

Details

These are readings of \(PM_{10}\), \(O_{3}\), temperature and humidity between 1 January 2004 and 30 June 2005 in Mexico City Metropolitan Area. Each observation is the 24--hr mean average (between 00:00 and 23:59 hrs), except for ozone, where the maximum over all the sliding 8--hour--windows, between 00:00 and 23:59 hrs is reported, viz. the daily maximum 8--hour moving average.

Examples

data(ap.mx)
summary(ap.mx[, -1])
class(ap.mx[, "PM10"])
# \donttest{
layout(matrix(c(1, 1, 2,3), 2, 2, byrow = TRUE))
plot.ts(ts(ap.mx$PM10), ylab = expression(PM[10]~"Series"), 
        col = "brown", xaxt = "n", las = 1)
xtick <- c(1, 92, 183, 275, 367, 457, 518)
xtext <- c("Jan/04", "April/04", "July/04", "Oct/04", "Jan/05",
           "April/05", "June/05")
axis(side = 1, at = xtick, labels = FALSE)
text(x = xtick, par("usr")[3], labels = xtext,
     pos = 1, xpd = TRUE, col = "black")
pacf(ap.mx$PM10, main = "", ylim= c(-0.5, 1), lag.max = 60, las = 1)
acf(ap.mx$PM10, main = "", ylim= c(-0.5, 1), lag.max = 60, las = 1)
# }