This Hemohim is some amazing stuff. I love it. It also addresses the issue you bring up. Please, connect with me if you want to get some.
Other than that, we here in LA saw a lot of rain in March, which is not typically a month when we get rain especially a down poor. It was neat because the skies cleared up with no smog around. And, since the lockdown, the smog hasn't really returned. It is pretty awesome.