Component	Formula or abbreviation	Source	Effect in atmosphere	Leaves Atmosphere by:	People affect cycling by:	We can manage it better by:
Nitrogen	N2	"volcanos, some bacteria	"inert, but it does melt meteorites	"N-fixing bacteria, lightning, fertilizer manufacturing, high temperature combustion "	"over enrichment of nitrogen compounds into living systems, soil and water through fertilizer over-use and NOx pollution - eutrophication "	"careful fertilizer use, lower NOx emissions through energy conservation and air pollution control systems "
Oxygen gas	O2	photosynthesis"	"21% of air, supplies O for ozone production, critical for most life	"combustion, respiration, ozone production, oxidation	"changing photosynthesis patterns through a variety of ways such as burning, power generation, deforestation, ozone depletion, climate change "	better mgt of climate "
carbon Dioxide "	CO2	Respiration, combustion, breakdown of CaCO3, volcanoes	"greenhouse gas: absorbs IR radiation	"photosynthesis, tropical coral reef growth	"burning fossil fuels, deforestation,	"conserve energy, preserve natural ecosystems, protect coral reefs, use alternative energy sources "
ozone	O3	"split and recombining of O2 high in the atmosphere. Also, ozone is a harmful product of smog "	Absorbs harmful UV, also causes lung diseases, damage to surfaces, plants	"destruction by chlorine molecule released from CFCs	"release of CFCs from refridgeration equipment, some industrial processes "	"maintain and dispose of air conditioners and refridgerators properly, phase out use of CFCs in industry "
water vapor	H2O	"evaporation, transpiration, some from combustion	"greenhouse gas, important in atmosphere energy systems, supplies water cycle "	Condensation, Precipitation	changing climate "	manage climate better "
"particulates and aerosols	P/A	"natural sources: wind erosion, sea salt, meteorites, pollen, dander, fires, volcanos. human sources: burning, increased soil erosion, industry, mining, war. "	"reflect light, shading surface, temp cooling, toxic diseases, can lead to acid rain, nitrogen over-enrichment, smog. May temporarily counteract some global warming effects in developed nations "	"condensation nuclei, precipitation, settle out	Causing exposed soil, barren areas, burning, industry,	"control particulates from human sources - burning: dont burn leaves, trash, avoid tropical beef, conserve energy. soil erosion: protect soil. industry: avoid the consumer disease of buying things you dont need. mining: recycle war: work for peace. trash burning: reuse, recycle, compost. internal combustion engines: car pool, conserve electricity, "
Nitrogen oxides	NOx	nitrogen mixes with oxygen; high temperature combustions; industry	makes smog and acid rain	smog, rain	high temperature combustion	Conserve energy, recycle
Chloro- fluoro- carbons	CFCs	" leaking refrigeration equipment, some industrial sources	" breaks down in stratosphere releasing chlorine molecule which destroys UV absorbing ozone"	" breaks down under UV light	" manufacture and release of CFCs	" maintain and dispose of air conditioners and refridgerators properly, phase out use of CFCs in industry "
Sulfur Dioxide"	SO2	" volcanoes, burning of high sulfur fuels coal, oil etc	" haze of SO2 aerosols reflect light - may counteract global warming in industrialized countries. CO2 from same areas continues to warm planet. Result: uneven global warming, possibly more condensation in cooler industrial areas."	" combines with water to make acid rain - 2(SO2)+O2+2(H2O)->2(H2SO4) Acid rain effects: damages plants, surfaces, aquatic reproduction."	height="15" "use of high sulfur coal, oil, some industries">	" continue to insist on using low s fuels and/or scrubbers to remove SO2, buy pollution credits, conserve energy"
Methane	CH4	Natural and artificial sources of decomposing organic matter, ruminants like cows, rice paddies, thawing permafrost,	Greenhouse gas	rain?	landfills, rice pattys, cows, industrial process	Lower industrial gas products
			Photochemical reaction produces smog