21 high school, college, public health, and medical students participated in the inaugural Summer Training Institute in Environmental Health at Mount Sinai. Students received didactic and hands-on training in environmental health topics, attended PEHSU and NYSCEHC meetings, and conducted mentored research and outreach. NYSCEHC and EMPH faculty led special seminars in a wide range of environmental health topics including climate change, air pollution, exposomics, microplastics, and vector-borne diseases. Lectures were supplemented with hands-on activities in message mapping and infectious disease transmission as well as Science Take Out kits on pesticide safety, healthy homes, and blood lead testing. Mentored projects included work on an Environmental Health E-screener, creation of an environmental health coloring book and educational videos targeted towards youth, participation in a school-based citizen science air pollution project, and summer bicycling program for inner city youth, amongst others.