Concerned over heavy pollution in Delhi, the European Union has directed its diplomats to install air purifiers in their offices and homes in the capital. "We don't need to monitor the pollution level, the US is doing that...But we need to respond for the safety of our staff, the EU delegation living in the city here," Joao Cravinho, the Ambassador and Head of Delegation of the European Union to India said on the sidelines of an environment meet on Wednesday.