English Language · English

Read the passage and answer the question that follows: 'Subway systems are vital for urban transit, but they present unique environmental health challenges. Commuters are regularly exposed to elevated levels of airborne particulate matter, particularly fine metallic dust generated by the friction of train wheels on steel rails. Studies indicate that spending prolonged periods in poorly ventilated underground platforms significantly increases the risk of respiratory and cardiovascular issues, making daily transit a silent hazard for millions.' What is the tone of the author in this passage?