You are presented with the question "What has a negative impact on the environment?" and the following answer choices: 
- massive damage
 - deforestation
 - Hemp
 - harmful substances
 - Particulate matter
 - Bamboo
 - enormous damage to homes
 - Biocompostables

Now knowing that pollutants have a negative impact on the environment and benzene, like ozone and particulate matter, is a nonthreshold pollutant, choose the best answer.


 

     Particulate matter    