(Two friends, Amy and Jessi, are conversing on air pollution)

Amy: Hi! How are you? Why are you looking dull?
Jessi: Oh! I am to come through a way where there is a lot of factories to school. I am really affected because of that.
Amy: It is due to air pollution.
Jessi: We learnt about this in science lesson in our last term.
Amy: Yes! The presence of one or more chemicals in the atmosphere is air pollution.
Jessi: What are the sources of air pollution? I totally forgot. Also tell the steps to prevent it.
Amy: It is caused by both natural and artificial means. In natural means, volcanoes, fumaroles, hot springs, decay from marshes, bogs. In artificial means, there are so much, for example, stationary and mobile sources.
These steps, as well as many others, are things we all can do to help reduce air pollution.Conserve energy – remember to turn off lights, computers, and electric appliances when not in use.Use energy efficient light bulbs and appliances.Participate in your local utility's energy conservation programsDo you understand?
Jessi: Yes! Thanks for telling me about that. See you later. Bye.
Amy: Bye!