HEI Annual Report: Expanding Our Vision for a Healthier Environment

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We’re pleased to share the Health Effects Institute’s 2025 Annual Report: Expanding Our Vision for a Healthier Environment. This year’s report highlights the many initiatives, research, and programs that helped make 2025 such a successful year. This success comes from our sponsors, board and committee members, researchers, partners, collaborators, staff, and others who work to help provide impartial science to inform decisions that foster a healthier environment for all.

The report highlights our progress and ongoing work, including the following:

• 2025 marked 45 years of HEI’s work advancing high-quality, impartial, and relevant science on the health effects of air pollution.
• Ongoing research on environment and health, including studies on public health impacts and scientific methods.
• The release of HEI Energy’s first studies.
• Expanded Global Initiatives, with new partnerships and capacity-strengthening efforts.

Read the Report