Building management system with clean air features

A computer-implemented method for controlling building equipment based on an indoor air quality (IAQ) ventilation analysis of a building, the computer-implemented method comprising:

• determining, by a processing circuit, an area occupancy schedule based on executing an occupancy schedule model, wherein the area occupancy schedule comprises a plurality of occupied periods, and wherein executing the occupancy schedule model comprises:
• determining, by the processing circuit, a time series particle disturbance based on a time series outdoor airflow rate and IAQ data;
• determining, by the processing circuit, one or more data points of the time series particle disturbance, wherein each of the one or more data points is a particle disturbance threshold, wherein determining the one or more data points is based on executing a regression model;
• identifying, by the processing circuit using the time series particle disturbance, a plurality of occupied time ranges for a day, wherein each of the plurality of occupied time ranges comprises a start time from that is greater than the particle disturbance threshold and an end time from that is less than the particle disturbance threshold;
• and
• combining, by the processing circuit, the plurality of occupied time ranges for the day based on overlapping occupied time ranges to create the area occupancy schedule;
• and
• modifying, by the processing circuit, a control strategy for an area of the building by operating HVAC equipment to control the time series outdoor airflow rate based on the area occupancy schedule.

A building management system (BMS) for controlling building equipment based on an indoor air quality (IAQ) ventilation analysis of a building, the BMS comprising:

• a controller comprising memory and one or more processors configured to:
• collect IAQ data from one or more sensors within the building;
• use the IAQ data to (i) identify a transient time period and (ii) estimate an actual outdoor airflow rate for an area of the building during the transient time period;
• determine the transient period based on analyzing the IAQ data and identifying at least one of (1) a period of time longer than a minimum length of time (2) a peak-to-peak concentration change greater than a minimum peak-to-peak concentration change, (3) a decay rate greater than a minimum decay rate, and (4) a derivative peak in a first half of the period of time;
• and
• modify a control strategy for the area of the building in response to detecting a deviation between (i) the actual outdoor airflow rate estimated using the IAQ data and (ii) a ventilation schedule for the area of the building, wherein modifying the control strategy comprises operating HVAC equipment to control the actual outdoor airflow rate in accordance with the ventilation schedule.