Examlex
A perfect competitor will operate at peak efficiency only in the __________.
Smog
A type of air pollution, typically a mixture of smoke and fog, that can have harmful effects on health and the environment.
Air Pollution
The presence of harmful or excessive quantities of substances including gases, particles, and biological molecules in Earth's atmosphere which can cause disease, death to humans, damage to other living organisms such as food crops, or the natural or built environment.
Chemical Reactions
Processes in which substances interact to form new products, involving changes in molecular structure and energy.
Exhaust Emissions
The gases and particles released into the atmosphere from an engine or other machinery combustion process.
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