Check out our paper showing that the future of urban air quality requires consideration of non-combustion emissions, a highly diverse mix of sources like consumer/commercial products and materials. It published as a highlight paper in ACP (https://www.atmos-chem-phys.
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For VOCs and less-volatile gas-phase organics, it shows that a more holistic approach that also considers non-combustion emissions is warranted moving forward. The open access paper can be directly downloaded at: https://www.atmos-chem-phys.net/18/5391/2018/acp-18-5391-2018.pdf