I'm pretty sure a vented mask is at least as effective as a cloth or surgical mask in that regard, both of which mostly contain the aerosol spray rather than actually filter out small particles. I doubt the stores you go to require true respirators?

Apparently the CDC agrees: https://www.cdc.gov/coronavirus/2019-ncov/hcp/respirator-use...

> Yes, an N95 filtering facepiece respirator will protect you and provide source control to protect others. A NIOSH-approved N95 filtering facepiece respirator with an exhalation valve offers the same protection to the wearer as one that does not have a valve. As source control, findings from NIOSH research suggest that, even without covering the valve, N95 respirators with exhalation valves provide the same or better source control than surgical masks, procedure masks, cloth masks, or fabric coverings.