Air Pollution and Atmospheric Pollution in Hindu Kush Himalaya (HKH) Region and Their Adverse Impacts on the Human Health, Ecosystems, Water Quality and Agricultural Activities in the Region: A Review

The Hindu Kush Himalaya (HKH) region faces a growing crisis of air and atmospheric pollution, driven by a complex interplay of factors including rapid urbanization, industrial emissions, agricultural practices, and transboundary pollution. This pollution, encompassing particulate matter, ozone, and other harmful gases, is having devastating consequences across the region. On human health, the polluted air contributes significantly to respiratory illnesses, cardiovascular diseases, and even premature deaths. Vulnerable populations, such as children and the elderly, are particularly susceptible. The region's ecosystems are also under severe stress. Air pollution disrupts plant growth and biodiversity, affecting the delicate ecological balance of the mountains. Deposition of pollutants alters soil chemistry and water quality, impacting forest health and the survival of many species. Water resources, crucial for the livelihoods of millions, are threatened by atmospheric deposition of pollutants. Acid rain and the settling of particulate matter contaminate rivers, lakes, and glaciers, affecting water availability and quality for drinking and irrigation. Agricultural activities are also adversely affected. Air pollution damages crops, reduces yields, and contaminates food sources, impacting food security and farmer livelihoods. Soot deposition accelerates glacier melt, further exacerbating water scarcity and increasing the risk of glacial lake outburst floods. The HKH region's vulnerability to climate change is amplified by air pollution, demanding urgent and coordinated action to mitigate these adverse impacts. Finally, the review emphasizes the need for integrated mitigation strategies and further research to protect the health and livelihoods of the millions of people dependent on the HKH region.