Gases in ambient air are measured in various units. Like ppm, ppb, percentages, microgtam per cubic meter etc. What are these exactly? I am new to the air field. earlier I worked with soil and water where such type of confusion were not present. Please help me to understand in a lucid manner.

Thank you

Regards

Dr. Satish Bhagwatrao Aher

Scientist B

Air monitoring and Exposure Assessment laboratory

ICMR-NIREH, Bhopal, INDIA

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