Dara & I are grateful to have been part of ROCIS Cohort 47. It was a privilege to glimpse this part of our invisible world and learn more of the health connections. Gaining a better understanding of our indoor air and our air shed—the large numbers connected to such small particles from everyday activities—was an eye opener. The data, analysis, insights, shared experiences and web resources were invaluable. And we now have an important IAQ baseline for our planned renovations!