The ETL BUS is the new All-In-One air quality monitoring solution designed and manufactured by Unitec, for indicative measurement (Directive 2008/50/EC) and specifically engineered in a box for car or bus roof for 3D environmental monitoring.The ETL BUS is a multiparametric station equipped with Unitec SENS-IT for continuous gas and dust monitoring with high precision and accuracy, featured by easy use and very low ownership costs. The ETL BUS is equipped with a fully integrated dust monitoring module based on orthogonal light scattering technology for real-time particulate monitoring (PM10 or PM2.5 or PM1). Alternatively the ETL BUS can be equipped with integrated OPC dust module for multi PM simultaneous monitoring (PM10, PM2.5 and PM1). For both solution the ETL BUS has an automatic autozero calibration system that ensures long-time reliable measurement, reducing drift and maintenance activities. The ETL BUS is engineered in an homologated car roof box for easy and direct outdoor installation.