AB544 extending green and white stickers signed.

[cwerdna]

As I posted at http://www.mynissanleaf.com/viewtopic.php?p=518980#p518980:

I just noticed https://arb.ca.gov/msprog/carpool/carpool.htm was updated recently (Jan 30, 2018) which has a pointer to https://ww2.arb.ca.gov/resources/fact-sheets/californias-clean-air-decals with some FAQs.

From the latter, there's

Are there income eligibility requirements for the new decal if I’m applying for a plug-in hybrid or battery-electric vehicle?
No. However, starting on January 1, 2018, if a consumer’s gross annual income is above the thresholds provided below, they are only eligible for the Clean Air Decal and not a rebate through the Clean Vehicle Rebate Project (CVRP).

Are there income eligibility requirements for the new decal if I’m applying for a fuel cell vehicle?
Yes. Starting January 1, 2018, if a consumer’s gross annual income is above the thresholds provided below, they have to choose between getting a Clean Air Decal or a CVRP rebate.

There's a table that follows.

It also has a bunch of discussion on expiration dates.