The document discusses various types of environmental pollution including atmospheric and water pollution. It contains sections on particulate matter (PM) in the atmosphere, sources of water pollution, and biological oxygen demand (BOD) and chemical oxygen demand (COD) in water. The sections cover topics such as the size and composition of PM, common air and water pollutants, how BOD and COD are used to measure organic pollution in water, and standards for drinking water.

4.  Tropospheric Pollution
Particulate Pollutants
 Water Pollution
Causes of Water Pollution
International Standards for Drinking
Water
CONTENTS
 Atmospheric Pollution  Water Pollution

5. Intro
duction
Size
of PM
Main
Pollutants
Photo
chemical
Smog
•Effect of
Photo
•chemical
Smog

6. PM stands for particulate matter (also
called particle pollution):
 The term for a mixture of solid
particles and liquid droplets found in
the air.
 Some particles, such as dust, dirt,
soot, or smoke, are large or dark
enough to be seen with the naked eye.
 Others are so small they can only be
detected using an electron
microscope.

11. Sources of Water
Pollution
Main Pollutants
BOD & COD
Eutrophication
International
Standards
For
Drinking Water

14. Organic Inorganic
Air
Pollutants
Pesticides Arsenic PM
Plastic,
Polymers
Cadmium
Green house
gases
Dyes Chromium Smog
 First bullet point here
 Second bullet point here
 Third bullet point here
Phenols Copper
Radio
nuclides
Nitro
compounds
Lead Alpha
PAHs Cyanide Beta
Chloroaniline Zinc Gamma

15. The chemical oxygen demand (COD) is
an indicative measure of the amount
of oxygen that can be consumed
by reactions in a measured solution.
 Biochemical oxygen demand (BOD) is
the amount of dissolved oxygen needed
(i.e. demanded) by aerobic biological
organisms to break down organic
material present in a given water sample
at certain temperature over a specific
time period.
BOD & COD

16.  The BOD value is most commonly expressed in
milligrams of oxygen consumed per liter of
sample during 5 days of incubation at 20 °C and
is often used as a surrogate of the degree
of organic pollution of water.
 COD commonly expressed in mass of oxygen
consumed over volume of solution which in SI
units is milligrams per liter (mg/L).
 A COD test can be used to easily quantify the
amount of organics in water within few hours.
 The most common application of COD is in
quantifying the amount of
oxidizable pollutants found in surface
water (e.g. lakes and rivers) or
 wastewater.
The graph shows the value of BOD & COD
in Japan and overseas.

17. Definition
Breakdown
Of Organic
Matter
Complete
breakdown of
Pollutants
Break down
Materials
Strong
Oxidizing
Reagents
Time
Value

20. Methemoglobinemia (MetHb) is
a blood disorder in which an
abnormal amount of methemoglobin
is produced.

21. Fluoride in Water