Plastic particles less than 5 mm in diameter are referred to as 'microplastics.' These microscopic plastic particles are typically found in industrial effluents or as a result of the decomposition of larger plastic trash.
The study suggested that microplastics have become an important component of clouds, polluting practically everything we eat and drink through "plastic rainfall."
As with pinene, many monoterpenes occur in two mirror-image forms: (+) alpha-pinene and (-) alpha-pinene. Plants can release both forms of these volatile molecules directly after biosynthesis or from storage pools in leaves. Because the two chiral or enantiomeric forms have identical physica