Answer:
1. Respiratory problems
Explanation:
Air pollution is defined as the contamination air in the surrounding through industrial waste, burning fuel in vehicle and burning of coal etcetera.
Air pollution contaminates the air around us in which we breathe and breathing is an essential process for human beings. Breathing in an air polluted environment can cause Respiratory problems such as lung cancer, shortness of breath, asthma episodes and coughing.
Hence, the correct answer is "1. Respiratory problems".
