# Changes in numbers or allowances ERA5SL?

**URL:** <https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844>\
**Category:** C3S - Datasets and Usage\
**Tags:** era5\
**Created:** [1 May 2025 13:21 UTC](https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844 "2025-05-01T13:21:47Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Kevin\_Marsh](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/kevin_marsh/32/368_2.png) [@Kevin\_Marsh](https://forum.ecmwf.int/u/Kevin_Marsh)\
**Post date:** [2 May 2025 14:53 UTC](https://forum.ecmwf.int/t/changes-in-numbers-or-allowances-era5sl/12844/2 "2025-05-02T14:53:35Z")

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Hi, there was a change in the some ERA5 family dataset limits for netCDF requests at the start of April; see here for details:

> [@Limitation change on netCDF ERA5 requests](https://forum.ecmwf.int/t/limitation-change-on-netcdf-era5-requests/12477):
>
> As many users will have already noticed, a change has recently been implemented in some ERA5 datasets with respect to the retrieval of data in NetCDF format versus GRIB format. The native ERA5 data is in GRIB format. When you download the data in NetCDF, additional processing is required which impacts the performance of the system. For this reason, a smaller amount of data in NetCDF can be retrieved rather than in GRIB format. You can check whether your request is within scope using the data d…

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