3:00 pm - 4:00 pm EPA Tools & Resources Webinar: Microplastics August 20 @ 3:00 pm - 4:00 pm EPA Tools & Resources Webinar: Microplastics The ubiquity of microplastics in the environment is an emerging concern. These small plastics (<5 mm) along with associated contaminants may be consumed by organisms including humans and have been found in every environment on Earth.