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In this article, we discuss about the seasonal variations in the monoterpene emission rates and chemical composition of monoterpenes from selected tropical tree species of Central India. The highest normalized total average monoterpene emission rates (normalized at 30°C) from all the plant species were found in summer followed by rainy and winter seasons, respectively. The composition of individual monoterpene compounds emitted from all the tropical plant species showed significant seasonal variations. Nine monoterpene compounds were determined across three seasons from these selected plants: α‐pinene, β‐pinene, and limonene represented up to 72.6% of the total monoterpene emission. Although the main compounds emitted were α‐pinene, β‐pinene, and limonene, the other minor compounds were also found at varying emission rates. α‐Terpinene and carene were not observed in Eucalyptus globulus and Pongamia pinnata during winter and rainy seasons. Sabinene was only recorded from Azadirachta indica. We have thus observed clearly that the seasonal as well as monthly variations in chemical composition of monoterpene emission rate are species specific. Furthermore, the effect of environmental variables such as temperature (TEM), photosynthetically active radiation (PAR), relative humidity, and carbon dioxide from plant species in distinct seasons revealed that the monoterpene emissions were mainly temperature (TEM) and PAR dependent.

While airborne particulate matter (PM) pollution is a serious problem for urban environments, it can be reduced through uptake by plant leaves. In this study, we investigated and compared the uptake of PM-bound toxic metals by different plant species. Enrichment factor (EF) and correlation analyses across different sample types indicated anthropogenic origins of these toxic metals with airborne source signatures. Scanning electron microscopy (SEM) analyses of both leaf surfaces (adaxial and abaxial) suggested that the micro-morphological properties of the leaf surface (e.g., stomata, trichomes, epicuticular wax, and epidermal appendages) control the accumulation of PM and associated metals in plant leaves. Senna siamea leaves showed the most micro-morphological variation as well as the maximum concentration of toxic metals. It was found that foliar uptake of PM-bound toxic metals is affected by leaf surface morphological characteristics. Our results imply that plant speciation strategies can be used to help decrease PM pollution. Novelty StatementThe collaborative study was intended to assess the effect of micro-morphological leaf surface properties on the accumulation of PM and associated toxic metals. To this end, accumulation potential of airborne toxic metals was assessed by plant leaves from distinct locations of an urban environment in India. The uptake pattern of toxic metals (PM bound) by plant leaves through the airborne route is considered as a relatively less common eld. Our ndings offer valuable insights into the role of plant species in controlling airborne PM pollution in urban environments.

SW-846 is not intended to be an analytical training manual. Therefore, method procedures are written based on the assumption that they will be performed by analysts who are formally trained in at least the basic principles of chemical analysis and in the use of the subject technology.