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A list of possible lung cancer symptoms.

Mercury, also known as quicksilver, is a naturally-occurring metal that is toxic to living organisms.

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.

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

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

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

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

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

Ozone is a highly reactive form of oxygen.

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