ap.mx {VGAMextra}

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.

Source

National Institute of Ecology. Gathers and disseminates the data generated by the central air quality monitoring network in Mexico City. Website: https://www.gob.mx/inecc/

Examples

data(ap.mx)
summary(ap.mx[, -1])
class(ap.mx[, "PM10"])

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)