How about HEPA as in EPA? I worked there in the late 70's right after it was formed by merging two loser agencies and sending out a request to other Govt agencies to send them 10 of their "best". I still remember Thelma Bertha Jones, who had been sent to three different agencies as a "10 of your best"! Now EPA is just a bunch of lawyers!
On second thought, clean air should not rhyme with EPA!