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What is an air gap used for in pesticide application?

  1. To allow air circulation in storage rooms

  2. To maintain proper chemical ratios

  3. To prevent back-siphoning into water supplies

  4. To separate different types of pesticides

The correct answer is: To prevent back-siphoning into water supplies

An air gap is used in pesticide application to prevent back-siphoning into water supplies. This is important to ensure that pesticides do not contaminate water sources and cause harm to humans and the environment. Option A is incorrect because air gaps are not used for air circulation in storage rooms, as they primarily serve to protect water sources. Option B is incorrect because while maintaining proper chemical ratios is important for effective pesticide application, it is not the main purpose of an air gap. Option D is also incorrect as air gaps are not used to separate different types of pesticides, but rather to prevent cross contamination or contamination of water sources.