Building management system with particulate sensing

An air handling unit of an HVAC system of a building, the air handling unit comprising:

• ducting through which airflow is controllably pushed by one or more fans of the HVAC system;
• one or more air dampers coupled to the ducting;
• and
• an integrated sampling system comprising:
• piping coupled to at least one of the ducting or the one or more air dampers and configured to collect a plurality of air stream samples, wherein each of two or more pipes of the piping comprise an inline pump of a plurality of inline pumps configured to selectively activate and provide an air stream sample of the plurality of air stream samples from each of the two or more pipes of the piping to a plurality of integrated sensors;
• the plurality of integrated sensors configured to measure characteristics of at least one of the plurality of air stream samples, wherein a first integrated sensor of the plurality of integrated sensors is configured to measure a first species of the air stream sample, and wherein a second integrated sensor of the plurality of integrated sensors is configured to measure a second species of the air stream sample;
• and
• a processing circuit configured to:
• selectively control operation of at least one of the plurality of inline pumps responsive to estimating one or more air quality indicators of the air handling unit based at least one of a measurement of the first species or a measurement of the second species, wherein at least one air quality indicator of the one or more air quality indicators is a combined outdoor air fraction of a plurality of outdoor air fractions corresponding to a plurality of measurements in at least one of the plurality of air stream samples.

A computer-implemented method for particulate sensing of a building, the computer-implemented method comprising:

• collecting, by an integrated sampling system from piping, a plurality of air stream samples;
• selectively providing, by the integrated sampling system using a switching manifold, an air stream sample of the plurality of air stream samples from one or more pipes of the piping to a plurality of integrated sensors of the integrated sampling system;
• measuring, by the integrated sampling system using the plurality of integrated sensors, characteristics of at least one of the plurality of air stream samples comprising a first species and a second species;
• estimating, by the integrated sampling system, one or more air quality indicators of an air handling unit based on at least one of a measurement of the first species or a measurement of the second species, wherein at least one air quality indicator of the one or more air quality indicators is a combined outdoor air fraction of a plurality of outdoor air fractions corresponding to a plurality of measurements in at least one of the plurality of air stream samples;
• and
• controlling, by the integrated sampling system, operation of the air handling unit responsive to estimating the one or more air quality indicators.