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Hydraulic fracturing, or fracking, is a method used to extract natural gas and oil from deep rock formations known as shale. Using this method, drilling operators force water, sand, and a mix of chemicals into horizontally drilled wells, causing the shale to crack and release natural gas or oil.

Do you think about air quality? If not, today’s the day to start. What can you do? Use the Air Quality Index (AQI) to help plan your outdoor activities.

An engaging video geared to raise awareness of environmental public health and our nation's need for the Tracking Network.

Read about the negative health effects of particle pollution — and find steps you can take to prevent them.

Learn how ground-level ozone can harm your health — and what you can do to protect yourself.

Air Pollutants

Find information on public health issues related to air quality, including asthma, heart disease and stroke, and more.

Air Quality and Emergencies

This is the Air Pollution and Respiratory Health home page.

This is the Air Pollution and Respiratory Health home page.