Quality opacimeters represent a revolution in tunnel instrumentation, offering a number of invaluable benefits. These advanced devices ensure accurate and reliable measurements of air opacity, enabling accurate assessment of air quality in tunnels. Their state-of-the-art technology detects suspended particles, providing essential data to control pollution and improve environmental safety. In addition, these opacimeters are highly sensitive and capable of identifying emissions quickly and efficiently, facilitating an immediate response to any anomaly. This real-time monitoring capability optimizes air management in tunnels, ensuring cleaner and safer environments for all users.