How to do it...

Perform the following step to see all the datasets in R and using airquality:

> data()
> str(airquality)
Output
'data.frame': 153 obs. of 6 variables:
 $ Ozone : int 41 36 12 18 NA 28 23 19 8 NA ...
 $ Solar.R: int 190 118 149 313 NA NA 299 99 19 194 ...
 $ Wind : num 7.4 8 12.6 11.5 14.3 14.9 8.6 13.8 20.1 8.6 ...
 $ Temp : int 67 72 74 62 56 66 65 59 61 69 ...
 $ Month : int 5 5 5 5 5 5 5 5 5 5 ...
 $ Day : int 1 2 3 4 5 6 7 8 9 10 ...
> head(airquality)
Output
Ozone Solar.R Wind Temp Month Day
1 41 190 7.4 67 5 1
2 36 118 8.0 72 5 2
3 12 149 12.6 74 5 3
4 18 313 11.5 62 5 4
5 NA NA 14.3 56 5 5
6 28 NA 14.9 66 5 6