en.wikipedia.org/wiki
Vocabulary
acid rain Precipitation or deposits with a low (acidic) pH.
aerosols Airborne solid particles or liquid droplets.
air The mixture of gases present in the atmosphere.
anthropogenic Human-based causes.
atmosphere A layer of gases that surrounds the planet; composed of five layers.
global dimming A reduction in the amount of radiation reaching the Earth’s surface.
global warming The recent increase in the Earth’s temperature.
greenhouse effect The atmosphere’s trapping of heat energy radiated from the Earth’s
surface.
greenhouse gases The cause of global warming by certain gases via the greenhouse effect.
outdoor air pollution Chemical, physical, or biological agents that modify the natural
characteristics of the atmosphere and cause unwanted changes to the environment and
to human health.
ozone depletion Reduction in the stratospheric concentration of ozone.
ozone hole A seasonal decline of ozone over Antarctica.
primary pollutants Substances released directly into the atmosphere by processes such
as fire or combustion of fossil fuels.
secondary pollutants Substancesformedwhenprimarypollutantsinteractwithsunlight,
air, or each other.