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Introduction

Pollution of air and water of Class 8

Air is a mixture of several gases. Water vapour and fine dust particles. A human being respires about 22,000 times every day and takes in about 16kg of air.  Air contains mainly nitrogen. Oxygen and smaller amounts of argon, carbon dioxide, water vapors and traces of helium, neon, krypton and xenon.

COMPOSITION OF AIR:

Component Symbol Volume
Nitrogen N2 78.084%

99.998%

Oxygen O2 20.947%
Argon Ar 0.934%
Carbon Dioxide CO2 0.033%
Neon Ne 18.2 parts per million
Helium He 5.2 parts per million
Krypton Kr 1.1 parts per million
Sulfur dioxide SO2 1.0 parts per million
Methane CH4 2.0 parts per million
Hydrogen H2 0.5 parts per million
Nitrous Oxide N2O 0.5 parts per million
Xenon Xe 0.09 parts per million
Ozone O3 0.07 parts per million
Nitrogen dioxide NO2 0.02 parts per million
Iodine I2 0.01 parts per million
Carbon monoxide CO trace
Ammonia NH3 trace

Air composition

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