What is hunting reserve?

plz tell correct answer​

It’s a place where people buy animals and put them on a acre or two of land and put them there, wait for them to flourish and then hunt them

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”