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Air pollution can occur naturally or be caused by human activities. [3] Air pollution causes around 7 million deaths each year. [4] [5] It is a significant risk factor for a number of pollution-related diseases, including heart disease, stroke, chronic obstructive pulmonary disease (COPD), asthma and lung cancer.
The mortality rate from vehicular pollution can be twice as high near heavily traveled roads, based on a study conducted in Holland at residences 50 meters from a main road and 100 meters from a freeway. [1]
Smog, or smoke fog, is a type of intense air pollution.The word "smog" was coined in the early 20th century, and is a portmanteau of the words smoke and fog [1] to refer to smoky fog due to its opacity, and odor. [2]
Radioactive waste was both released into the air and flowed into the Columbia River (which flows to the Pacific Ocean). In 2014, the Hanford legacy continues with billions of dollars spent annually in a seemingly endless cleanup of leaking underground
Smog in Delhi is an ongoing severe air-pollution event in New Delhi and adjoining areas in the National Capital Territory of India. [48] Air pollution in 2016 peaked on both PM 2.5 and PM 10 levels. [49] It has been reported as one of the worst levels of air quality in Delhi since 1980. [50]
A lack of cold air flow, combined with slow-moving air masses carrying industrial emissions, collected airborne pollutants to form a thick layer of smog over the region. Levels of PM 2.5 particulate matter averaged over 150 micrograms per cubic metre; in some areas, they were 300 to 500 micrograms per cubic metre.
Air pollution is a big problem in Peru, especially in Lima, the capital city, which is caused by industrial activity and vehicle emissions. In August 2006, air pollution in Lima surpassed the international standard by 122.1% The average concentration of PTS reached 166.57 micrograms per cubic meter, the international standard is 77 micrograms ...
The air pollution in downtown Cairo is more than 10 to 100 times of acceptable world standards. [8] Cairo has a poor factor because of lack of rain and its layout of tall buildings and narrow streets, which create a bowl effect (bad ventilation and consequent trapping of pollutants). The main air pollution problem in Egypt is particulate matter.