Why does few linchens survive close to power station but many survive alongside roads?

Lichens are sensitive to air pollution, particularly sulfur dioxide and heavy metals, which are often emitted from power stations. The concentration of pollutants near power stations can create an inhospitable environment for lichens, leading to their decline. In contrast, roadside areas may experience some pollution, but the levels can be lower and more variable, allowing lichens to adapt and thrive in those environments. Additionally, roadside habitats may offer a variety of microclimates and substrates that support lichen growth.