Is there a way to not log specific syslog messages?

For example I have the following: pam_unix(sudo:session): session opened for user root(uid=0) by (uid=997) pam_unix(sudo:session): session closed for user root pam_unix(cron:session): session closed for user root pam_unix(cron:session): session opened for user root(uid=0) by (uid=0) The log files are being flooded with them and was wondering if there was a way to reduce this by not logging this. It looks like this is just background noise from a session in use?