My /boot/efi is at 96% full and getting a warning I need to examine that directory.

root@system76-pc:/boot/efi/EFI# df -kh /boot/efi

/dev/nvme0n1p1 487M 464M 23M 96% /boot/efi

root@system76-pc:/boot/efi/EFI# du -skh *


306M Pop_OS-10e07064-28b2-44f0-bfff-74712952d5f6

139M Recovery-E172-484E

100K systemd

root@system76-pc:/boot/efi/EFI# cd Pop_OS-10e07064-28b2-44f0-bfff-74712952d5f6/

root@system76-pc:/boot/efi/EFI/Pop_OS-10e07064-28b2-44f0-bfff-74712952d5f6# du -skh *

4.0K cmdline

152M initrd.img

133M initrd.img-previous

11M vmlinuz.efi

11M vmlinuz-previous.efi

root@system76-pc:/boot/efi/EFI/Pop_OS-10e07064-28b2-44f0-bfff-74712952d5f6# lsblk

nvme0n1 259:0 0 465.8G 0 disk

├─nvme0n1p1 259:1 0 487M 0 part /boot/efi

├─nvme0n1p2 259:2 0 3.8G 0 part /recovery

└─nvme0n1p3 259:3 0 461.5G 0 part /

Is it safe to remove these files or is there any other way to clear the space in /boot/efi?