Air pollution doesn’t just affect you, but harms the plants around

New Delhi : A new study reveals that air pollution in particular area not only has devastating impact on human beings but also affects plants, animals and micro-organisms.

The study was conducted by researchers in the University of Sheffield and published in the journal Nature Communications. 

The findings reveal that the plants which are highly exposed to nitrogen dioxide (NO2) similar to levels recorded in major urban centers are able to better defend themselves against herbivorous insects. 

Handled by Dr Stuart Campbell as lead author of the study, the team has discovered that plants exposed to increased levels of pollution produce more defensive chemicals in their leaves. 

The study also reveals that insects feeding on these affected leaves may have cascading negative effects on communities of herbivorous creatures.

Dr Campbell said: "Nitrogen dioxide is a pollutant that causes severe health problems in humans, but our research has found that it may also be having a significant impact on plants and insects. Insects are a crucial part of nature and the world we live in. Insects are critical to the healthy functioning of ecosystems." 

"Many people may be aware that insect pollinators, such as the thousands of species of bees, along with flies, moths and butterflies, are crucial for food production - but they also ensure the long-term survival of wildflowers, shrubs and trees." 

Highlighting the impact on insects, Dr Campbell added: "Insects that feed on plants (herbivorous insects) help return plant nutrients to the soil, and are themselves food for wild birds, reptiles, mammals, and yet more insects. Insects are also immensely important for decomposing decaying organic matter and maintaining healthy soils. Scientists are warning about massive declines in insect numbers, which should be incredibly alarming to anyone who values the natural world and our sources of food.

"Nitrogen dioxide is a major component of smog and is an example of pollution caused from human activity, particularly our reliance on fossil fuels. Levels of this pollutant in the atmosphere remain particularly high in cities, and especially in the UK. Our research shows another example of the dangers of pollution to our environments and the reasons why we need to make a united effort to tackle it." 

Scientists also studied if insects have affect on the ability of plants to absorb NO2 from the environment. 

Plants that had been fed on by insects absorbed much less NO2, according to the study. The authors believe this indicates that insects could be influencing the amount of pollution removed from the air by urban green spaces. Urban trees can absorb gaseous pollutants like NO2, but the effects appear to vary between species and locations, and this may be due in part to the actions of leaf-feeding insects.