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Pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms.
Pollution can take the form of chemical substances or energy, such as noise, heat or light.
Peru's principal environmental problems are air pollution, water pollution, soil erosion and pollution, anddeforestation. Air pollution is a problem, especially in Lima, due to industrial and vehicle emissions.

Some 80% of the emissions come from the city’s vehicles. Diesel fuel is used by 60% of these and contains the highest level of sulphur and other dangerous particles of all available fuels.

According to the Institute of Peruvian Studies, Lima suffers from the worst air pollution among the capitals ofLatin American countries.

Pollution is causing more health problems such as asthma, bronchitis, and even heart disease, the report said.

In August 2010, air pollution in the center of Peru's capital Lima surpassed the international standard established by the American Agency of Environmental Protection by 122.1 percent, informed Peru's National Statistics and Information Institute (INEI).Efforts to Improve

The government, industry and general public have all worked together to decrease air pollution in the U.S. Through government mandates, technological improvements and a more conscious attitude, air pollution statistics have improved dramatically.
The Clean Air Act declared primary air quality standards in order to protect American residents. In order to meet these newguidelines, many different practices were adopted. Industries made efforts to reduce emissions and to filter them. Car manufacturers attempted to make their vehicles more environmentally-friendly. U.S. residents developed more proactive attitudes about their own activities.
Air Pollution Statistics

According to statistics calculated by the Environmental Protection Agency (EPA), the United Statesis in much better shape today than they were several years ago.
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• Americanshave reduced toxic releases by more than 50 million tons since 1970. If that many tons were deposited in dump trucks, the trucks would stretch from Baltimore to Dallas (all the way around the world) if lined up bumper-to-bumper.

• Currently, it would take 20 of today's new automobiles to release the same number of emissions as a 1960s model.

• Carbon monoxide emissions (CO) have decreased by33 percent. Forty-one fewer tons are being produced per year as a result of current efforts. Much of these emissions are from cars, trucks, buses, lawn and construction equipment.

• Large utility and industrial boilers and other mechanical devices are producing 12 percent less nitrogen oxide emissions. This is 3.3 million tons fewer each year. Nitrogen oxide is a contributing factor to ozoneformation.

• Sulfur dioxide emissions have reduced by 38 percent or 13 million tons per year. These emissions are typically associated with large boilers. Acid rain has been a product of these emissions in the past.

• Dropping 14 million tons per year, volatile organic compound emissions have decreased by 42 percent. VOC emissions are a factor in the formation of the ozone layer.

•Particulate matter emissions reduced by 9 million tons per year, or a 75 percent reduction.

• Decreased by 98 percent, lead emissions have reduced by 217 thousand tons per year.

• The EPA statistics indicate that the decrease in emissions is about 48 percent across the board, reducing pollution by 109 million tons of toxic fumes.

Differences in Measurements

In the past 20 years, the...