You will hear a lecture. After listening to the lecture, in 10 seconds, please speak into the microphone and retell what you have just heard from the lecture in your own words. You will have 40 seconds to give your response.
The lecture is about the difference between air pollution in 1950s and recent years. At the beginning of the lecture, the speaker mentions in the 1950s, factories were the main source of air pollution releasing visible black smoke and fog, which caused many diseases and even death. Also, the speaker mentions that the factories stopped after imposing clean act regulation. Lastly, the speaker indicates that these days, the source of air pollution has been changed and people are still struggling with new invisible pollution released from cars and Lorries because people are more vehicle dependent.