Back to Show
PBS News Hour
How moss revealed an undetected threat in Portland
Portland, Oregon, prides itself on being very focused on the environment. So many people were shocked to discover that certain neighborhoods contain high levels of toxic metals. Scientists made the discovery when ordinary moss samples taken from all over town revealed the unexpected contamination. Special correspondent Cat Wise reports on how it led to some significant changes in the city.
Support Provided By
57:46
October 27, 2025 - PBS News Hour full episode
26:45
October 26, 2025 - PBS News Weekend full episode
26:45
October 25, 2025 - PBS News Weekend full episode
57:46
October 24, 2025 - PBS News Hour full episode
56:42
October 23, 2025 - PBS News Hour full episode
57:46
October 22, 2025 - PBS News Hour full episode
57:46
October 21, 2025 - PBS News Hour full episode
57:46
October 20, 2025 - PBS News Hour full episode
26:44
October 19, 2025 - PBS News Weekend full episode
26:44
October 18, 2025 - PBS News Weekend full episode
57:46
October 17, 2025 - PBS News Hour full episode
57:46
October 16, 2025 - PBS News Hour full episode