Production was suspended for a planned two weeks due to the extraordinary air pollution caused by heavy smoke from the wild fires surrounding Moscow in August 2010. It eventually resumed three weeks later. Even with this precaution, smoke still made it into a lot of shots and had to be digitally removed in post production.
The involvement of Timur Bekmambetov as producer afforded the production the opportunity of using Russia as a backdrop instead of the usual USA locations. Bekmambetov owns a film production company in Moscow called Bazelevs where most of the movie was made.