The CitySense Project aims to harness crowd-sourcing to enable citizens to passively collect environmental sensor data as they move through their city. Citizens will carry sensor packs that measure carbon monoxide, smoke particles, carbon dioxide, temperature, and location data. Over 30 citizens including couriers, students, and a government minister will participate in the initial swarm to generate sensor readings. The data will be visualized on a city dashboard to provide accurate descriptions of environmental conditions across the city. The project seeks to rapidly prototype this citizen sensor swarm approach to smart cities.