Explanation:

• Statement 1 is incorrect: Ozone in the stratosphere protects life on Earth from harmful ultraviolet (UV) radiation and is therefore often called ‘good’ ozone. This is in contrast to ozone in the troposphere, the lowest layer of the atmosphere, where it is an air pollutant and can be harmful to humans, animals and vegetation. 

• Tropospheric ozone is a harmful air pollutant that can cause respiratory problems, damage crops, and aggravate lung conditions. 

• Statement 2 is correct: Ozone is called a “secondary” pollutant because it is not emitted directly into the air, but is created by chemical reactions between  two primary pollutants i.e oxides of nitrogen (NOx) and volatile organic compounds (VOC). 

• This happens when pollutants emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources chemically react in the presence of sunlight.

Hence option 2nd is correct.