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Chapter 2

Environmental Health Sciences

Environmental health sciences examines how environmental factors—such as air and water quality, hazardous waste, climate change and toxic exposures—affect human health. The field focuses on reducing harmful exposures and creating healthier, safer communities by addressing issues like pollution, environmental toxins and the health impacts of climate change. As the world faces growing environmental challenges, the need for skilled experts in environmental health sciences continues to rise, making this an impactful area of public health.

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Environmental Health Sciences Careers Outlook

Professionals in environmental health sciences work to mitigate risks and improve public health outcomes on a global scale. They work in a variety of settings, including government agencies, environmental consulting firms, research institutions, hospitals and nonprofit organizations.

Environmental health professionals can pursue careers such as:

  • Environmental Health Specialist: Assesses and mitigates environmental hazards that impact community health, such as water and air quality issues.
  • Toxicologist: Evaluates the effects of chemicals and toxins on human health to support regulatory and safety measures.
  • Environmental Health Policy Analyst: Evaluates public health and healthcare policies for their potential impact on human health.

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Average Median Salary

$79,000

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Employment in environmental health science and safety fields is projected to grow by 5-8% through 2033. The median salary is around $79,000 a year, and could be more depending on the role and level of experience.

Environmental Health Sciences Master’s Degrees at Columbia

At the Columbia Mailman School of Public Health, students can pursue a Master of Public Health (MPH) or a Master of Science (MS) in Environmental Health Sciences (EHS), with distinct pathways tailored to their interests and career aspirations.

The MPH in Environmental Health Sciences provides a broad foundation in public health, offering the following eight courses of study: biological mechanisms, environmental health, epidemiology, data analysis, occupational hazards and policy analysis. This degree is ideal for public health practitioners seeking to address environmental health challenges with interdisciplinary expertise.

The MS in Environmental Health Sciences is designed for individuals with strong scientific or quantitative backgrounds who are seeking to develop specialized skills for impactful careers in research, data science, policy and more. The program offers specialized training through two unique tracks - Toxicology and Environmental Health Data Science

Two unique tracks for study:

Toxicology

Focused on understanding and mitigating the adverse human health effects of toxicants, this track equips students with expertise in environmental exposure, regulation and mitigation. The program includes hands-on lab work, Applied Practice Experience (APEx) and a Master’s research thesis, providing a robust foundation for careers in regulatory agencies, consulting, pharmaceuticals and academia.

Environmental Health Data Science

This track emphasizes quantitative and computational skills, preparing students to analyze and interpret environmental health data. Students gain expertise in geospatial modeling, data management and advanced statistics, supported by a research thesis that applies data science to pressing environmental health issues.

With rigorous academic training, hands-on learning opportunities and access to renowned faculty, Columbia Mailman School’s Environmental Health Sciences master’s programs prepare students to lead efforts in addressing environmental health challenges and shaping healthier, sustainable communities worldwide.

Student Perspective


Dr. Kathleen Anne Crowley MPH '91

Dr. Crowley, a two-time Columbia Mailman alumna (MPH '91, DrPH '13), is a leader in environmental health and safety, currently serving as the Vice President of EH&S at Columbia University. In her role, she oversees safety across multiple campuses and hospitals, with a focus on proactive health programs and sustainable waste management. Her Columbia Mailman education prepared her to tackle environmental health challenges, with her leadership particularly highlighted during the COVID-19 pandemic.

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Want to learn more about Environmental Health Sciences at the Columbia Mailman School?