# Issue with Downloading ERA5 Pressure-Level Data via the CDS API

**URL:** <https://forum.ecmwf.int/t/issue-with-downloading-era5-pressure-level-data-via-the-cds-api/15098>\
**Category:** C3S - Datasets and Usage\
**Tags:** api, cds, era5\
**Created:** [24 June 2026 08:01 UTC](https://forum.ecmwf.int/t/issue-with-downloading-era5-pressure-level-data-via-the-cds-api/15098 "2026-06-24T08:01:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sim\_seonmi](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@sim\_seonmi](https://forum.ecmwf.int/u/sim_seonmi)\
**Post date:** [24 June 2026 08:01 UTC](https://forum.ecmwf.int/t/issue-with-downloading-era5-pressure-level-data-via-the-cds-api/15098/1 "2026-06-24T08:01:30Z")

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hello.  
I’m downloading ERA5 vertical profile data using the CDS API, but the download time has become extremely long.

I’m using the **“derived-era5-pressure-levels-daily-statistics”** dataset and need **all pressure levels**. Previously, downloading a single file took about **2 hours** , but now it takes **more than 16 hours just to download one day of data**.

To reduce the request size, I tried splitting the pressure levels into **five separate groups** and downloading them separately, but the download is still very slow.

Do you have any recommendations for a better approach?

I need to download **10 years of data up to July** , and I’m running out of time.