I sympathize if you are an allergy sufferer. But actually California native oaks are far more numerous, and they are prolific pollen producers at the same time in the spring as the Acacias.
What was pointed out to me by a California MD allergy specialist, is that people think they are allergic to Acacia when in fact it is the oak pollen that is often the primary antagonist.
What are we going to do, kill all the native oaks too?
There are preventive health care measures that can help you to overcome sensitivity to allergens.
I use Traditional Chinese Medicine, herbs and acupuncture as my primary health care system. I used to have allergies to grass pollen but don't since using TCM, and I haven't had a cold or flu in over 30 years.
Please don't kill all the acacias, they are beautiful when they bloom in early spring.