TYPES OF POLLUTANTS
In general the air pollutants can be sub divided into 2 catexampleories:
Primary pollutants and Secondary pollutants
Primary pollutants
These are the pollutants which are emitted/generated directly from the sources.
Some examples are:
Particulate Matter
Such as smoke, ash, fumes, dust etc.
Inorganic gases
Such as carbon monoxide, sulphur dioxide etc.
Secondary Pollutants
These are the pollutants which are formed in the atmosphere by chemical interaction among primary pollutants and normal atmospheric constituents.
Some examples are nitrogen dioxide, ozone, sulphur trioxide, aldehyde, ketones, various sulphate and nitrate salts.