R: omit drop NA missing values

Locate NAs

which(is.na(airquality))

##  [1]   5  10  25  26  27  32  33  34  35  36  37  39  42  43  45  46  52  53  54
## [20]  55  56  57  58  59  60  61  65  72  75  83  84 102 103 107 115 119 150 158
## [39] 159 164 180 249 250 251

Omit all NAs

which(is.na(na.omit(airquality)))

## integer(0)

Drop rows containing NAs

which(is.na(tidyr::drop_na(airquality,"Ozone")))

## [1] 121 125 181 182 183