Answer:
HUMAN ACTIVITY
1.Use of aerosol sprays.
2.Emmision of smoke from cars.
3.Rotting garbage in landfills.
4.Smoke from powerplants.
5.Spraying chemical fertilizers.
6.Surface mining operations.
7.Smoke from factories.
8.Deforestation.
WAYS TO REDUCE
1.Reduce the use of chemicals.
2.Walk or use bicycle instead of riding a car.
3.Reuse,reduce and recycle.
4.Follow the clean air act.
5.Reduce the use of chemicals.
6.Reducing energy consumption and increasing use of renewable energy.
7.Follow the clean air act.
8.Plant more trees.