The question asks about the general categories of atmospheric pollution that are studied. Atmospheric pollution is typically categorized based on the region of the atmosphere where it occurs and its impact.
A) Option i is correct because atmospheric pollution is broadly studied based on the atmospheric layers it affects: the troposphere and the stratosphere. These two layers experience different types of pollution with distinct environmental impacts.
The question asks to identify the substance in the stratosphere responsible for blocking a significant portion of the Sun's harmful Ultraviolet (UV) radiation. This is a direct knowledge-based question about the Earth's atmospheric layers and their protective functions.
The stratosphere contains the ozone layer, which is primarily composed of ozone gas (\(O_3\)). This layer plays a vital role in absorbing about 99.5% of the Sun's harmful ultraviolet (UV) radiation, particularly UV-B and UV-C rays. Without the ozone layer, these radiations would reach the Earth's surface, causing severe damage to living organisms, including skin cancer, cataracts, and harm to plant life.
The question asks about the efficiency of the ozone layer in blocking harmful UV radiation. The ozone layer in the stratosphere plays a crucial role in absorbing most of the Sun's harmful ultraviolet (UV) radiation, preventing it from reaching the Earth's surface. We need to identify the percentage of harmful UV radiation that is absorbed by the ozone layer.
Correct Option: B) 99.50%
The ozone layer absorbs approximately 99.5% of the Sun's harmful UV radiation, preventing it from reaching the Earth's surface. This makes it a highly effective protective shield.
The question asks about the nature of undesirable particles that cause tropospheric pollution. Tropospheric pollution refers to the presence of harmful substances in the lowest layer of the Earth's atmosphere, the troposphere. These substances can exist in various physical states.
A) Solid or Gaseous. Tropospheric pollution is caused by the presence of undesirable substances in the air, which can be in solid form (e.g., dust, soot, pollen), liquid form (e.g., mist, aerosols, acid rain droplets), or gaseous form (e.g., carbon monoxide, sulfur dioxide, nitrogen oxides, volatile organic compounds). Option A covers solid particulate matter and gaseous pollutants, which are the two largest categories of air pollutants.
The question asks to identify the number of major gaseous air pollutants. This requires recalling the commonly recognized categories of gaseous pollutants that significantly impact air quality and human health.
Correct Option: C) Six
The six major gaseous air pollutants are Carbon Monoxide (CO), Sulfur Dioxide (SO2), Nitrogen Oxides (NOx), Ozone (O3), Volatile Organic Compounds (VOCs), and Ammonia (NH3). While some sources might list fewer or more depending on the level of detail or specific regulatory context, 'six' represents a widely accepted number for the primary gaseous pollutants.
The question asks to identify examples of particulate pollutants from the given list. Particulate pollutants are tiny solid particles or liquid droplets suspended in the air. We need to classify each item in the list as either a particulate pollutant or a gaseous pollutant.
B) Options i,ii,iv,v