<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the main cause of air pollution? Context: The main cause of air pollution is emissions from vehicles and industries. Answer: [/INST]Emissions from vehicles and industries are the main causes of air pollution.</s>