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Question 1

these are abandoned or otherwise unused commercial or industrial sites, many of which are suspected to contain hazardous waste, contaminants, or pollutants.

Answer 1

Brownfields

Question 2

these compounds are organic chemical compounds made up of only carbon, chlorine, and fluorine. CFCs are commonly used in aerosol sprays (such as hair spray), as refrigerants (most commonly known as brand-name Freon®), foam-blowing agents, and solvents

Answer 2

Chlorofluorocarbons (CFCs)

Question 3

is a flammable gas at room temperature that has a strong odor. Indoors, the level of formaldehyde in the air can vary, depending on temperature, humidity, and air exchange rate within that space.

Answer 3

Formaldehyde

Question 4

An underground storage tank has been in place for 15 years. What is its remaining useful life, on average?

Answer 4

zero years