chapters 12-13 Crossword

when harmful substances build up in the air to unhealthy levels the result is___?
put directly into the air by human activity is____?
forms when primary pollutants react with another primary pollutant
almost ______ of our air pollution comes from gasoline burned by vehicles?
___ have no tailpipe emissions
is a machine that moves gases through a spray of water that dissolves many pollutants
____is the long term prevailing weather conditions at a particular place.
degrees north or south of the equator is called___?
___is the name given to the short term periodic change?
when the water in the eastern pacific ocean is cooler than usual this is called__?
____is an area in the stratosphere where ozone is highly concentrated?
_____might be damaging the ozone layer?
____is a thinning in the stratospheric ozone?
high altitude clouds made of water and nitric acid are called?
the average temperature at earth's surface increases is called?