Environment Pollution and Its Management
The pollutants that are directly emitted to the environment from the source is known as ______.
The sources of air pollution that are directly related to the activities of the nature are called ______.
What is the term used for describing any undesirable changes in the fresh air which harms humans and other living beings?
all of them
Which of them is the cause of decreased visibility and lack of sunlight on the Earth's surface?
none of them
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