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Breathing air is a fundamental human need, yet its safety, e.g., when challenged by various harmful or lethal substances, is often not properly guarded. Currently, air toxicity is monitored only for single or limited number of known toxicants, thus failing to fully warn against possible hazardous air. Here, using a photoionization detector (PID) or GC-MS/FID we found that within minutes living rats emitted distinctive profiles of volatile organic compounds (VOCs) via breath when exposed todoi:10.1101/739003 fatcat:oo3e7vpxvrapvkmue2ygyijuw4