# Question regarding nonroad VOCs speciation based on NEI emission inventory

**URL:** <https://forum.cmascenter.org/t/question-regarding-nonroad-vocs-speciation-based-on-nei-emission-inventory/1409>\
**Category:** SMOKE\
**Tags:** admin, smoke\
**Created:** [April 3, 2020, 7:31am UTC](https://forum.cmascenter.org/t/question-regarding-nonroad-vocs-speciation-based-on-nei-emission-inventory/1409 "2020-04-03T07:31:00Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Ryan](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@Ryan](https://forum.cmascenter.org/u/Ryan)\
**Post date:** [April 3, 2020, 7:31am UTC](https://forum.cmascenter.org/t/question-regarding-nonroad-vocs-speciation-based-on-nei-emission-inventory/1409/1 "2020-04-03T07:31:00Z")

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Dear all,  
Recently I am working on nonroad California VOCs speciation based on NEI emission inventory and SCC profiles. I tried to search related references and found the following process details which I would like to follow (Please find the slides and process figure attached below). But I have no idea where I can find the data of Engine size and Engine Technology etc for California. Could you please give me some instructions?  
(Please note that I am working with the speciation of VOCs to real VOCs species rather than model species.)

The slides which I find useful is [https://www3.epa.gov/ttn/chief/conference/ei21/session10/reichle\_pres.pdf](https://www3.epa.gov/ttn/chief/conference/ei21/session10/reichle_pres.pdf)

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Any details are highly appreciated！

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Best regards,  
Ryan

 ![1](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/1X/3640fcb83e5cc0dd1de21e91aed639ee7b8286b7.png)

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**Author:** ![bbaek](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.cmascenter.org/bbaek/32/22_2.png) [@bbaek](https://forum.cmascenter.org/u/bbaek)\
**Post date:** [April 7, 2020, 6:36pm UTC](https://forum.cmascenter.org/t/question-regarding-nonroad-vocs-speciation-based-on-nei-emission-inventory/1409/2 "2020-04-07T18:36:10Z")

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Have you checked the SPECIATE website? I think the information you are looking for should be in that SPECIATE DBs. It has the SCC information, SCC-specific speciation profiles, and so on.

> **[SPECIATE | US EPA](https://www.epa.gov/air-emissions-modeling/speciate)**
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> SPECIATE is the EPA’s repository of volatile organic gas and particulate matter (PM) speciation profiles of air pollution sources

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**Author:** ![eyth.alison](https://avatars.discourse-cdn.com/v4/letter/e/7ab992/32.png) [@eyth.alison](https://forum.cmascenter.org/u/eyth.alison)\
**Post date:** [April 7, 2020, 6:48pm UTC](https://forum.cmascenter.org/t/question-regarding-nonroad-vocs-speciation-based-on-nei-emission-inventory/1409/3 "2020-04-07T18:48:38Z")

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There is a nonroad speciation report here ([https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100UXK7.pdf](https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100UXK7.pdf))

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**Author:** ![Ryan](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@Ryan](https://forum.cmascenter.org/u/Ryan)\
**Post date:** [April 8, 2020, 7:15pm UTC](https://forum.cmascenter.org/t/question-regarding-nonroad-vocs-speciation-based-on-nei-emission-inventory/1409/4 "2020-04-08T19:15:13Z")

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Many thanks for these useful materials!