Explanation:

Only statements 1&2 are correct.

• Ground-level ozone is “a colourless and highly irritating gas that forms just above the Earth's surface (up to 2 miles above the ground). 

• Ground-level ozone is also called as tropospheric ozone (O3).  

• It’s not directly emitted into the air but rather produced when two primary pollutants react in sunlight and stagnant air. These two primary pollutants of Ground-level ozone are nitrogen oxides (NOx) and volatile organic compounds (VOCs). Ground-level ozone is called a Secondary pollutant. The pollutant from Ground-level ozone can also travel long distances due to wind and affect rural areas also.

• Ground-level ozone is a highly reactive gas, it has serious health consequences. The pollutant from Ground-level ozone can also affect sensitive vegetation and ecosystems, including forests, parks and wildlife refuges.

Hence option 1st is correct.