InMAP runs with county level NEI return 0/NaN values -- why?

[Emma Rieves]

Hi all,

Just ran InMAP using county-level livestock NEI emissions from 2019. Attached are emissions input file (.shp), a screenshot of the output shapefile, config file (.toml) and InMAP output log. The values I'm getting are 0/Nan, but given that the input emissions file contains emissions for several pollutants, I'm wondering why this is. Please let me know if you have any insight into this.

Thanks,

Emma

[Chris Tessum]

The key part of the output log file is here:

===

2025/08/22 15:49:51 Emission totals:
2025/08/22 15:49:51 gOrg, NaN μg/s
2025/08/22 15:49:51 pOrg, 0 μg/s
2025/08/22 15:49:51 PM2_5, NaN μg/s
2025/08/22 15:49:51 gNH, NaN μg/s
2025/08/22 15:49:51 pNH, 0 μg/s
2025/08/22 15:49:51 gS, NaN μg/s
2025/08/22 15:49:51 pS, 0 μg/s
2025/08/22 15:49:51 gNO, NaN μg/s
2025/08/22 15:49:51 pNO, 0 μg/s
===

This is saying that InMAP is reading the sum of the emissions as 0 for some pollutants and NaN for other ones. The NaN totals may happen if there is a row in the emissions shapefile that is NaN or NULL or some other unreadable value. And then if there is one NaN value that will propagate through to all the other numbers it touches as InMAP is running.

Hope that helps!

Chris

[Emma Rieves]

Hi Chris,

Thanks for your prompt input! 

I changed the NaNs (I was exporting the wrong version of the emissions file in my cleaning script) to 0s, but am still having a similar issue. The output file still has all pollutants initializing with a value of at 0 ug/s and it then finishes with a NaN% increase at the first convergence check (see attached log file). This seems like it wouldn't be the case though, since several pollutants have nonzero emissions values in the input emissions file (see attached screenshot) and since I wouldn't expect this sector (livestock) to produce zero concentrations as a result of the run. I'm wondering if you--or anyone else--has any other advice on what might be going wrong.

The emissions in question are 2019 county-level NEI emissions downloaded from the EPA's platform. Could the issue be that the emissions aren't gridded?

Any advice you can share would be greatly appreciated.

Best,

Emma