Air quality monitoring system and method

An identification method for identifying a target chemical at a site, the identification method comprising:

• providing a sampling inlet to:
• capture a sample of air from an atmosphere surrounding the site;
• providing a compound sensor, comprising:
• a sample cell to receive the sample of air from the sampling inlet;
• a light source adjoined to the sample cell to emit a beam of light,
• wherein the beam of light passes through the sample cell;
• and
• a spectrophotometer adjoined to the sample cell;
• generating a first transmission spectrum of the beam of light with the spectrophotometer;
• transmitting a sample of air for interacting with the beam of light in the sample cell;
• generating a second transmission spectrum of the beam of light in response to interacting the sample of air with the beam of light with the spectrophotometer;
• processing the second transmission spectrum by:
• denoising and de-biasing the second transmission spectrum to generate a processed second transmission spectrum;
• generating an absorption spectrum of the beam of light by calculating absorbance of the beam of light by the sample of air based on:
• comparing the first transmission spectrum to the processed second transmission spectrum;
• and
• identifying the target chemical by decomposing the absorption spectrum to extract an absorption spectra related to the target chemical.