Learn how air pollution can harm your health and the environment, and what EPA is doing to protect the air we breathe.

Understanding and addressing climate change is critical to EPA’s mission of protecting human health and the environment.

EPA partners with more than 40 data contributors from various government agencies, academic institutions, and other organizations to compile a key set of indicators related to the causes and effects of climate change.

This indicator tracks the extent, age, and melt season of sea ice in the Arctic Ocean.

This indicator tracks the extent of sea ice around Antarctica.

This indicator measures the amount of time that ice is present on lakes in the United States.

This indicator examines the balance between snow accumulation and melting in glaciers, and it describes how glaciers in the United States and around the world have changed over time.

This indicator measures the amount of land in North America that is covered by snow.

This indicator measures trends in mountain snowpack in the western United States.