Solution: just wear it over your mouth not your nose; tell people youre breathing through your nose and exhaling through your mouth due to coffee breath

Solution: Wear the mask off your ear or around your neck. It shows that you're still at least halfway devoted to the cause of signaling your own virtue and playing the make-believe symbolism game withOUT the whole pesky problem of "drinking in the same four or five recycled breaths in the sweltering July heat" dilemma.