• Air pollution is caused by any undesirable substance. • Air pollution is a major problem in modern society. • Substances include various gases and tiny particles, or particulates that can harm human health and damage the environment. • Pollution occurs on different levels: personal, national, and global.
• Some pollutants come from natural sources: • Forest fires emit particulates, gases, and • VOCs (substances that vaporize into the atmosphere) • Volcanoes spew out sulfur dioxide and large amounts • of pulverized lava rock known as volcanic ash.
• Vehicle emissions, together with stationary and natural sources, are important in the formation of ground level ozone, which causes health damage as well as damage to vegetation and crops.
• Rapid urbanization • Growing energy needs • Uncontrolled industrial growth • Increase in traffic
The major air pollutants
• • • • •
Carbon monoxide (CO) Nitrogen oxides (NOx) Sulfur dioxide (SO2) Lead (Pb) Acid rain
• Deadly gas • Colorless, odorless & tasteless gas • Causes headaches, death • Effects on plants
• Vehicles (plus others)
• • • •
Reduce visibility Killing plant tissues Causing leaves to fall Damage fabrics & fade dyes High-temperature combustion
• Eye and lung irritation • Damage to limestone and concrete
• Sulfur in fuel is emitted as SO2
• Brain and kidney damage • Effects learning abilities • One sixth of inhaled lead contributes to poisoning • Children and pregnant women are most at risk • Sources: • Metals processing, battery mfr, etc
Protect the earth from sun’s harmful rays Ozone Hole: An area in ozone layer where the amount of ozone has been greatly reduced. Effects: • Skin cancer • Shortness of breath • Chest pain when inhaling deeply • coughing
• It occurs when moisture in the air interacts with nitrogen oxide and sulfur dioxide. • Acid rain pollutants fall as dew, drizzle, fog, snow or rain.
• Factories, power plant & motor vehicles
• World Health Organization states that 2.5 million people die each year due to air pollution, with 1.5 million of these deaths attributable to indoor air pollution. • Worldwide more deaths per year are linked to air pollution than to automobile accidents. • Air pollution causes death due to asthma, emphysema, lung & heart diseases and respiratory allergies. • These effects can result in medication use, increased doctors, emergency room visits, more hospital admissions, and pre-mature death.
• Legal incentives are the main cause of the decline of the air pollution.
Clean Air act (1963) : • It was the first of a series of acts and amendments that exerted increasing pressure on air pollution. NAAQS : • Established standards for various major pollutants such as carbon oxide, nitrogen dioxide, ozone, sulphur dioxide. PSI : • PSI (pollutant standard index) was used particularly in cities to monitor air quality.
• There is a lack of greenery in our cities, so we should grow plants & trees. • We should ban all those vehicles which are creating air pollution at larger scale. • All Factories & industrial units should be placed outside the cities • We should avoid using plastic bags because it contributes a lot in polluting the environment
If every one of us play a significant role in improving the quality of our surroundings, our environment can be as clean and clear like this.
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