Indoor air quality sensor calibration systems and methods

An indoor air quality (IAQ) method, comprising:

• by a first sensor of a first IAQ sensor module, measuring a first amount of an item in air at the first IAQ sensor module, wherein the item is one of particulate matter, volatile organic compounds (VOC), and carbon dioxide;
• by a second sensor of a second IAQ sensor module that is different than the first IAQ sensor module, measuring a second amount of the item in air at the second IAQ sensor module;
• selectively determining an average of the first amount and the second amount;
• determining a first offset for the first sensor based on a first difference between the average and the first amount;
• determining a second offset for the second sensor based on a second difference between the average and the second amount;
• determining a first adjusted amount of the item in the air at the first IAQ sensor module based on the first amount and the first offset;
• and
• determining a second adjusted amount of the item in the air at the second IAQ sensor module based on the second amount and the second offset
• wherein:
• selectively determining an average includes determining the average in response to receipt of an indication that the first and second IAQ sensor modules are located within a predetermined distance of each other and within the same room of the building;
• and
• determining the first and second offsets includes determining the first and second offsets in response to the receipt of the indication that the first and second IAQ sensor modules are located within the predetermined distance of each other and within the same room of the building.

An indoor air quality (IAQ) system for a building, comprising:

• a first IAQ sensor module comprising a first sensor configured to measure a first amount of an item in air at the first IAQ sensor module, wherein the item is one of particulate matter, volatile organic compounds (VOC), and carbon dioxide;
• a second IAQ sensor module that is different than the first IAQ sensor module and that comprises a second sensor configured to measure a second amount of the item in air at the second IAQ sensor module;
• an average module configured to selectively determine an average of the first amount and the second amount;
• an offset module configured to:
• determine a first offset for the first sensor based on a first difference between the average and the first amount;
• determine a second offset for the second sensor based on a second difference between the average and the second amount;
• an adjustment module configured to:
• determine a first adjusted amount of the item in the air at the first IAQ sensor module based on the first amount and the first offset;
• and
• determine a second adjusted amount of the item in the air at the second IAQ sensor module based on the second amount and the second offset;
• a minimum module configured to selectively store a minimum value of the first amount when a mitigation device has been on for at least a predetermined period,
• wherein the mitigation device is configured to decrease the first amount of the item in the air when the mitigation device is on;
• a storing module configured to selectively store the minimum value as an initial minimum value;
• and
• an offset module configured to determine a drift offset for the first sensor based on a difference between the minimum value and the initial minimum value,
• wherein the adjustment module configured to determine the first adjusted amount of the item in the air at the first IAQ sensor module further based on the drift offset.