What percentage of the Earth's atmosphere is nitrogen?

A ratio that compares the amount of water vapor the air contains to the maximum amount that the air could hold at that temperature is

Water vapor can only condense on surfaces, such as a flower petal or car windshield.

The lowest layer of Earth's atmosphere, the one directly above the ground, is called the

Which layer of the atmosphere occupies 11-50 km above the Earth's surface and contains the ozone layer?

Which exists as O3 gas in the stratosphere as a protective layer from UV rays?

In what layer of the atmosphere do meteoroids burn up?

In which layer of Earth's atmosphere is the aurora borealis produced?

Carbon-containing fuels, or fossil fuels, formed millions of years ago from the remains of

How does carbon monoxide affect human health?

__________ is the release of damaging materials into the atmosphere.

This occurs when a layer of cool, dense air stays near the ground and under a layer of warm air; thus trapping smog close to the surface.

Pollutants are removed or changed chemically before they leave factory smokestacks by a(n)

Ozone depletion was caused by the following chemicals, which were used in refrigerators and aerosol spray cans.

In general, warm air can hold less water vapor than cooler air.

The ozone layer is a protective barrier when present within the troposphere, but is considered a pollutant when present in the stratosphere. 

Released directly into the atmosphere. Can cause damage on their own or might react with other products to cause damage.

Formed when primary pollutants react chemically with other substances.

Trace amounts of some air pollutants may contribute to cancer.

As a result of the Clean Air Act, today, gasoline used by cars and trucks in the United States contains very large quantities of lead.

According to the California Carbon Monoxide Poisoning Prevention Act of 2010, at least _______ CO alarm is required in all existing single-family dwellings with either a fuel-burning heater, fuel-burning appliance, fireplaces or an attached garage.

An organic compound found in gasoline and vehicle exhaust

An unhealthy mix of air pollutants that forms over cities and nearby areas.

Produced when soot combines with sulfur compounds and water droplets in the air.

A thick brownish haze that forms when sunlight acts on certain air pollutants such as nitrogen oxides and hydrocarbons.

The main source of photochemical smog is exhaust released by vehicles.

Government imposes vehicle inspection programs to have drivers fix cars that release high levels of pollutants (i.e. smog check)

Normally, air near Earth’s surface warms and rises, carrying pollutants with it.

The acids that form from pollution in the atmosphere then settle to the surface of Earth are called

The term _________ was used to describe the area of lowered ozone concentration over Antarctica.

The air you breathe in from the atmosphere is made mostly of

How does the ozone layer benefit living things on Earth? 

Substances, such as smoke and carbon monoxide, released into the air are called

What is the source of most air pollution?

What atmospheric condition caused London's "killer smog" of 1952 and regularly causes smog buildup in some cities, such as Los Angeles and Mexico City?

The pH scale is used to measure

What is the pH of a neutral solution?

Acid deposition cannot erode stone buildings or statues.

Which of the following is NOT a provision of the Clean Air Act?

A device in a motor vehicle that reduces the amount of air pollutants in emissions is a(n)

Harmful ____________ conditions, such as asthma and bronchitis, have been linked to air pollutants.

What two compounds are released as pollutants by urban areas that will later combine with water and oxygen in the atmosphere to become acid precipitation?

What do sulfur dioxide (SO2) and nitric oxide (NO) combine with in the atmosphere to produce acid rain?

What two compounds are produced when sulfur dioxide (SO2) and nitric oxide (NO) from urban areas combines with water (H2O) and oxygen (O2) in the atmosphere?

What is the pH of natural rainwater?

In general, air pressure decreases with altitude.

Signed in 1987 and is considered the biggest success story in addressing a global environmental problem.

Since its creation, the Clean Air Act has reduced the release of the worst air pollutants by 20% (despite an increase in the population)

The Montreal Protocol cut CFC production by 95% since the 1980s.