Gaseous (by-)products are often created while producing chemicals. These can take the form of innocent water vapour as well as smelly, irritating, poisonous or carcinogenic gasses.
- Emissions to the air or to atmosphere can be split up in two major groups: (1) 'guided' or intended emissions, such as smoke escaping through a chimney; (2) 'fugitive' or unintended emissions. These are leakages, usually limited emissions on 'weak' places such as valves, pumps etc.
- Legislation in connection with emissions is very extensive and rigid.
- It goes without saying that both guided and fugitive emissions have to be avoided as much as possible. To achieve this, BP applies a whole range of measures, both technical and otherwise (procedures, training, attitude...)
- Besides the environmental and health aspects, there is an economic aspect as well. Emissions are partly a loss of production, i.e. a loss of money
- The atmosphere in and near the installations is monitored, registered and guarded in every possible way. An example is the monitoring of emissions in the PX unit OPSIS.
- Odour nuisance is a special form of atmospheric pollution.