I want to know whether gaseous odorants occur together with VOCs in the real-world in large enough quantities to be considered important from an environmental remediation perspective or not? In many industrial scenarios, either large volumes of VOCs or odorants are emitted depending on the type of facility. VOCs also pose a threat from an indoor air pollution perspective. Odorants can also be found at wastewater treatment plants and agricultural facilities.

I want to know whether VOCs and odorants occur together in large enough amounts to be considered a threat from an environmental perspective or not? I know they occur together in biogas but VOC to H2S ratio is very low. I also suspect they are emitted together from wastewater facilities (kindly clarify if anyone has some info).

Can someone guide me to specific publications showcasing the emitted concentrations of such mixtures if they occur at all?