Agartala’s AQI spike to 264 followed firecracker smoke trapped by fog during Laxmi Puja, the Tripura Pollution Control Board said. Agartala AQI spike reached 264 after Laxmi Puja firecracker smoke was trapped by fog, the Tripura pollution board said. Agartala’s AQI spiked to 264 as firecracker smoke from Laxmi Puja got trapped by fog, says Tripura Pollution Control Board; air improved with sunshine.