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Asthma is an inflammatory disease of the lung. This inflammatory process can occur along the entire airway from the nose to the lung.

Ozone is a highly reactive form of oxygen.

Molds are microscopic organisms that play an important role in the breakdown of plant and animal matter.

Three billion people, nearly half of the world's population, use inefficient stoves to cook their daily meals.

Ragweed and other weeds such as curly dock, lambs quarters, pigweed, plantain, sheep sorrel and sagebrush are some of the most prolific producers of pollen allergens

Many people think animal allergies are caused by the fur or feathers of their pet.

Dust mites are tiny microscopic relatives of the spider and live on mattresses, bedding, upholstered furniture, carpets and curtains.

Air pollution is a mixture of natural and man-made substances in the air we breathe. It is typically separated into two categories: outdoor air pollution and indoor air pollution.

Commercials and extended videos featuring Michael, an Alaska Native, and member of the Tlingit tribe, has Chronic Obstructive Pulmonary Disease (COPD), a condition caused by smokinge. Videos from the Tips from Former Smokers campaign, which features real people suffering as a result of smoking and exposure to secondhand smoke.

Air Quality and Emergencies

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

Air Pollutants

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