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.
net/18/5391/2018/)(ACPD in August 2017). See more at Yale News: https://seas.yale.edu/news- events/news/study-shows-need- broaden-focus-sources-air- pollution.
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