Update output_topic_details.txt

output_topic_details.txt

@@ -74,3 +74,11 @@ Topic: Water Quality
 Description: The water quality in Los Angeles is moderate, with 9 contaminants in water including Arsenic, Bromate, Chromium, Haloacetic Acids, Nitrate, 
 Trihalomethanes and Uranium.
 
+Topic: Main Air Pollutant
+
+Description: Vehicle pollutants are the most harmful and contain greenhouse gases that cause climate change. Burning gasoline and diesel fuel creates harmful byproducts like nitrogen dioxide, carbon monoxide, hydrocarbons, benzene, and formaldehyde. In addition, vehicles emit carbon dioxide, the most common human-caused greenhouse gas.
+
+Topic: Main Source or Contributor of Air Pollution
+
+Description: Vehicle pollutants are the most harmful and contain greenhouse gases that cause climate change. Burning gasoline and diesel fuel creates harmful byproducts like nitrogen dioxide, carbon monoxide, hydrocarbons, benzene, and formaldehyde. In addition, vehicles emit carbon dioxide, the most common human-caused greenhouse gas.
+