Embodiments of the invention provide systems, devices, and method for monitoring gas emissions within a geographic area. A method for monitoring gas emissions may include providing a gas-monitoring device configured to be moved within the geographic area. The method may also include determining geographic locations of the device as the device is moved within the geographic area, determining a quantity of one or more gases in the air as the device is moved within the geographic area, and associating the geographic locations with the quantity of gases to provide gas emissions data for the geographic area. The gas emissions data may be communicated to one or more external devices, sources, and/or systems for analysis, documentation, and/or compliance reporting.