A system for gas monitoring and control comprising: a plurality of multiple-gas analysis devices (MGD1-MGD6), each positioned near a process facility within a region of interest around the process facility , each multiple-gas analysis device (MGD1-MGD6) capable of detecting the presence, concentration, or both, of one or more gases; and a data and control center communicatively coupled to each of the plurality of multiple-gas analysis devices (MGD1-MGD6), the data and control center including logic that, when executed, allows the data and control center to: monitor readings from the plurality of multiple-gas analysis devices (MGD1-MGD6), and if any readings indicate the presence of one or more contaminants, identifying the source of the contaminants based on the readings from the plurality of multiple-gas analysis devices (MGD1-MGD6); wherein the region of interest is indoors or outdoors; each multiple-gas analysis device (MGD1-MGD6) includes multiple sampling tubes that are fluidly coupled to and extend from the multiple-gas analysis device (MGD1-MGD6) to a location in or near the associated process facility ; the data and control center is communicatively coupled to a ventilation system configured to reduce the contaminant concentration within the region of interest ; and the data and control center is configured to control operation of the ventilation system. a plurality of multiple-gas analysis devices (MGD1-MGD6), each positioned near a process facility within a region of interest around the process facility , each multiple-gas analysis device (MGD1-MGD6) capable of detecting the presence, concentration, or both, of one or more gases; and a data and control center communicatively coupled to each of the plurality of multiple-gas analysis devices (MGD1-MGD6), the data and control center including logic that, when executed, allows the data and control center to: monitor readings from the plurality of multiple-gas analysis devices (MGD1-MGD6), and if any readings indicate the presence of one or more contaminants, identifying the source of the contaminants based on the readings from the plurality of multiple-gas analysis devices (MGD1-MGD6); wherein the region of interest is indoors or outdoors; each multiple-gas analysis device (MGD1-MGD6) includes multiple sampling tubes that are fluidly coupled to and extend from the multiple-gas analysis device (MGD1-MGD6) to a location in or near the associated process facility ; the data and control center is communicatively coupled to a ventilation system configured to reduce the contaminant concentration within the region of interest ; and the data and control center is configured to control operation of the ventilation system. monitor readings from the plurality of multiple-gas analysis devices (MGD1-MGD6), and if any readings indicate the presence of one or more contaminants, identifying the source of the contaminants based on the readings from the plurality of multiple-gas analysis devices (MGD1-MGD6); wherein the region of interest is indoors or outdoors; each multiple-gas analysis device (MGD1-MGD6) includes multiple sampling tubes that are fluidly coupled to and extend from the multiple-gas analysis device (MGD1-MGD6) to a location in or near the associated process facility ; the data and control center is communicatively coupled to a ventilation system configured to reduce the contaminant concentration within the region of interest ; and the data and control center is configured to control operation of the ventilation system. <EOS>