A sentence has been removed from the draft. A neighborhood science project is installing low-cost air-quality sensors near schools and busy roads. Organizers will compare patterns across locations but caution that the devices are not regulatory-grade monitors. [Missing sentence.] The project will periodically check the sensors against a reference instrument and publish uncertainty notes with the data. The writer wants to explain why calibration and comparison still matter. Which sentence best accomplishes this specific purpose: show how the sensors can reveal useful patterns without being treated as perfectly precise measurements?