The phrase "are very active at" is correct and usable in written English.
It can be used to describe someone's engagement or participation in a particular activity or location.
Example: "The volunteers are very active at the community center, organizing events and helping those in need."
Alternatives: "are highly engaged in" or "are quite involved in".
Most of the money they spend goes to organisations that are very active at the state level.
Business schools are very active at assuring quality at the course level - where institutions as a whole struggle or point more towards programme level satisfaction or league table results.
In fact, the Chinese government and Chinese companies are very active at ICANN, the organization that coördinates domain names and I.P. addresses, and Chinese engineers are heavily involved with the Internet Engineering Task Force, which coördinates the Internet's technical standards (and which met in Beijing last November).
Bai et al. (2014) Sulfonate surfactant such as alkyl benzene, alkyl naphthalene, alkyl indane and alkyl phenanthrene (anionic) All these surfactants are very active at low concentration.
The new catalysts are very active at 150 200 °C and free from difficult problems of SOx-deactivation and hydrothermal ageing of the NOx-absorption reduction catalyst.
Firstly, IRS is often expensive, inaccessible, and there are negative health impacts that can result from the indoor spraying of insecticides and secondly, mosquito nets are only used at night but mosquitoes are very active at dusk while people are still outdoors.
She was very active at Gary United Methodist Church where she volunteered in Wesley Shop for many years.
For the past 20 years she was very active at the Great Neck Senior Center where she taught painting, creative writing, and singing.
"The governor wants to be very active at the convention," said Rick Mroz, who recently stepped down as the governor's chief counsel and is her designee to the convention host committee.
He is very active, at the age of sixteen, he made his debut in Berlin as a violinist, and later accompanied Caruso on tour Also played for the St . Louis Symphony
MARKET OVERVIEW The lower to middle end of Quito's real estate market is very active at the moment, said Antonio Serrano, regional director of Re/Max Ecuador in Quito.
