Microplastics in Himalayan Glaciers: A Comprehensive Study of recent findings on characteristics and potential source

The Himalayan glaciers, crucial reservoirs of freshwater and delicate ecosystems, are confronting an alarming threat from microplastic pollution. Defined as plastic particles smaller than 5 mm, microplastics have been detected in these glaciers, raising significant concerns regarding their potential impacts on environmental integrity, human health, and aquatic biodiversity. Despite the growing awareness of microplastic pollution globally, there is a notable lack of information regarding snow microplastics in the Himalayan region. In this study, we collected surface snow samples from the western and central Himalayan glaciers during the pre-monsoon season of 2023 to quantify the presence and abundance of microplastics. Samples were obtained near two scientific research stations (Chorabari and Lahaul & Spiti) and from 13 field sites extending up to 20 km from these stations. We employed Agilent 8700 Laser Direct Infrared Chemical Imaging System (LDIR) to identify polymer compositions and analysed air mass back trajectories to ascertain the potential origins of the sampled air masses. Our findings revealed a diverse array of microplastics, including polyamide, polyethylene, polypropylene, and polystyrene, basically low-density plastic present in both glacier regions which are predominated by fragments with sized smaller than 100µm in both regions. The distribution and accumulation of microplastics were influenced by hydrological factors, such as glacier melting and runoff, as well as anthropogenic activities, including tourism and trekking. This research adds to the growing body of evidence on microplastic pollution in remote and high-altitude ecosystems, offering critical insights for policymakers, environmental managers, and researchers. The implications of this study are profound, enhancing our understanding of the regional distribution and impacts of microplastic pollution and informing the development of effective strategies to mitigate plastic waste and promote sustainable development. Human Health. This research contributes to a more nuanced perspective on the microplastic cycle and its profound implications for vulnerable ecosystems like the Himalayan Glacier, paving the way for future inquiries into this pressing and pervasive environmental challenge.