The police are now monitoring criminal/gang/drug 'activity' in the area.
There has been an increase in the city's (level of) economic 'activity'.
The instruments are used to detect volcanic 'activity' on the island.
(..) decompose, you know. He's gonna be up there forever. Meteorology estimates that he'll be covered in sand... From normal weather activity within a year. We can't wait a year. We got work to do. won't even launch for five years. (..)2015 The Martian