# \#megan

**URL:** https://forum.cmascenter.org/tag/megan/65.md

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## [MEGAN v3.2: How Should Ecotype Data Be Defined for Regional Applications?](https://forum.cmascenter.org/t/megan-v3-2-how-should-ecotype-data-be-defined-for-regional-applications/6267)

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**Author:** [@bb404bb](https://forum.cmascenter.org/u/bb404bb)\
**Replies:** 1\
**Last updated:** [August 12, 2026, 3:15pm UTC](https://forum.cmascenter.org/t/megan-v3-2-how-should-ecotype-data-be-defined-for-regional-applications/6267 "2026-08-12T15:15:15Z")

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Hello everyone, I am currently trying to use MEGAN v3.2. I have mostly understood the general workflow and am now able to generate BVOC emissions for use in the CMAQ model. However, I am still unclear about the Ecotype…

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## [Problem with METCRO2D using MEGAN inline](https://forum.cmascenter.org/t/problem-with-metcro2d-using-megan-inline/6138)

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**Author:** [@MariaMB](https://forum.cmascenter.org/u/MariaMB)\
**Replies:** 3\
**Last updated:** [January 22, 2026, 4:34pm UTC](https://forum.cmascenter.org/t/problem-with-metcro2d-using-megan-inline/6138 "2026-01-22T16:34:08Z")

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Hello! I’m using MEGAN inline in CMAQ version 5.4. I’ve used “prepmegan4cmaq” to prepare my input files and I’m getting the following error, related to my MCIP (v5.4) METCRO2D file: Value for PROMPTFLAG: T returning TR…

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## [ERROR in MEGAN OUTPUT CT3.csv](https://forum.cmascenter.org/t/error-in-megan-output-ct3-csv/5881)

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**Author:** [@Sunchanglei](https://forum.cmascenter.org/u/Sunchanglei)\
**Replies:** 2\
**Last updated:** [July 2, 2025, 8:26am UTC](https://forum.cmascenter.org/t/error-in-megan-output-ct3-csv/5881 "2025-07-02T08:26:50Z")

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Dear teachers, I used MEGAN32\_prep\_code to generate the CT3.csv, but when I tried to run it in the run.txt2ioapi.v32.csh script, it failed. From the CT3.csv, I found that there were many “100” values present. I think thi…

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## [How MCIP Identifies LAI or LAIv](https://forum.cmascenter.org/t/how-mcip-identifies-lai-or-laiv/5666)

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**Author:** [@wxy](https://forum.cmascenter.org/u/wxy)\
**Replies:** 2\
**Last updated:** [March 22, 2025, 5:15am UTC](https://forum.cmascenter.org/t/how-mcip-identifies-lai-or-laiv/5666 "2025-03-22T05:15:07Z")

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Hello everyone, I’m a new user of CMAQ and MEGAN. I really need some help. I want to use MEGAN3.2 in CMAQv5.4. Megan3.2 needs LAIv as one of the inputs. I used NOAH LSM in WRF, so the wrfout file has only LAI but not LA…