Before the industrial revolution of the nineteenth century, there was a wide distribution of colors In the peppered moth. Predatory bird Original population Phenotype Upon the darkening of tree bark by Industrial pollution, dark- colored moths increased in frequency and all other moths decreased. Prodatory bird Industrial polution population Light- and dark-colored moths on dark tree bark Phenotype After clean-air legistation was enacted in the tworntieth century, the bark color of trees became lighter, and so did the froquency of lighter-colored moths. Predatory bird Clean-air population Light- and dark-colored moths on light troe bark Phenotype (%) uopendod (%) uopejndod u kouenbe (%) uopendod Frequency in Frequency in

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Air Pollution

The excess accumulation of pollutants or undesirable alterations in the environment and its resources such as air, water, and land can be referred to as pollution. Pollution affects the components of the environment. Pollution is considered a global issue as it is showing harmful effects worldwide. Metropolitan cities are more impacted by pollution than countryside or villages.