CO2 is a little high.
Breathing does two things: it grabs O2 and it dumps CO2. Of these, the CO2 generally feels more urgent. If you hold your breath for a while and feel your lungs start to burn, you're feeling the effects of excess CO2.
(Hypoxia is also bad for you, but people tend to pass out before they notice it. Pilots get special training in how to spot the symptoms and react to them.)
So you'll have about 50% more CO2 in your atmosphere than Earth. That probably leads to a few rare (and exotic) complications, but also slightly more common acidity in various fluids. Like, tooth decay might be slightly more common on this world. For anyone worried about it though, the easy buffer is calcium cabonate (Tums, but also chalk like for a chalkboard). Natives are likely fine; visitors probably chow down on Tums, and anyone who doesn't drink beer gets kidney stones.
Vistors also likely have their lungs start burning with less exertion than their used to. That probably works about like how exercise in Denver makes you tired more easily, and goes away after a few weeks/months of acclimatization.