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Environmental pollution has emerged as one of the most pressing challenges in the contemporary world, affecting the quality of air, water, soil, and overall human health. Pollutants are substances or forms of energy introduced into the environment that cause undesirable changes. Understanding the classification of pollutants is fundamental to devising effective control and management strategies. Pollutants can be classified based on various criteria such as source, physical state, polluted area, and location. Based on the source, pollutants are generally divided into natural and anthropogenic pollutants. Natural pollutants originate from natural processes and events such as volcanic eruptions, forest fires, and dust storms. For instance, volcanic ash released during an eruption can affect air quality over a large region, while dust from arid regions may be transported by wind to other areas. Anthropogenic pollutants are derived from human activities, including industrial emissions, vehicular exhaust, agricultural runoff, and urban waste. For example, smoke from factories releasing sulfur dioxide and nitrogen oxides into the atmosphere, and pesticides washed into rivers, represent human-made pollutants. Considering the physical state, pollutants can be classified as solid, liquid, or gaseous. Solid pollutants include particulate matter such as soot, dust, and microplastics. Liquid pollutants typically consist of chemical effluents from industries, oil spills, and sewage discharge into water bodies. Gaseous pollutants comprise substances like carbon monoxide, methane, ozone, and volatile organic compounds. Each ___ _________ _______ ___ ____ _________ ______ _____ _________ _____.
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