First week of school for your kindergartner and what are you doing? Oh that's right, you're sick. Of course you are! Groups of people are perfect for germs to skip merrily from one victim to another, growing and spreading and expanding faster and faster! Now, you may have read the allergies or Multiple Chemical Sensitivity section and learned a bit about different filters, such as a Minimum Efficiency Reporting Value (MERV) 18 filter handling viruses, or a MERV 15 taking care of bacteria. While this is accurate, these filters do stop those pathogens from getting through, but just adding ventilation can help with diluting the air, reducing risk of having them there in the first place!