Developing a TIP list (Target Indoor Pollutants): Getting the benefits of the NAAQS but with consensus development and voluntary compliance. Given that the US population spends 90% of its day indoors where pollutant levels are often 2-5 times higher than outdoors, the choice of which building materials and consumer products to use, and how the indoor air is cleaned and ventilated, have a significant role on human health and well-being and climate change. A consensus driven TIP list is critically needed to ensure a strategic and effective approach to reducing sources and developing mitigation technologies.