Throughout the day there are changes in carbon dioxide concentration. The peak is at 8 AM at 1000 ppm and The lowest is at 4 PM at approximately 700 ppm. The earlier it is, the more concentration of carbon dioxide and in the evening it is there is less concentration of carbon dioxide . Hope this helps :)
Certain vaccines are live which means they are putting the actual virus into the patient thought the injection. This means people who are immune compromised can’t have these because they will get very sick. This is the only way I know how to answer