Could smog along the coast have caused the spike to 100 cpm on the radnet data on 4/2?

Could smog have caused the simultaneous spike on the radnet data on 4/2 to 100 CPM form 50 in Sacramento, San Francisco, San Diego and LA?
If you look at the graphs after the earthquake 100 CPM is actually the biggest increase since the earthquake from an average baseline of 50 CPM.

Its the Xenon. Its just

Its the Xenon. Its just coming on shore

How do you know?

How do you know? Can you reveal your identity? How do you know it is not more than that?