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Tehran, the capital city of Iran, suffers from a severe air pollution, and it is located near three major fault lines, while being the most populous region of the country. The officials have created financial incentives to encourage around 5 million citizens to leave the city. ==Air pollution== Tehran is rated as one of the world’s most polluted cities. Parts of the city are often covered by smog, making breathing difficult and causing widespread pulmonary illnesses. It is estimated that about 27 people die each day from pollution-related diseases.〔(Har Ruz 27 Tehrāni be Dalile Āludegiye Hawā mimirand ). September 18, 2006〕 According to local officials, 3,600 people died in a single month due to the hazardous air quality.〔(Iran smog 'kills 3,600 in month' ). BBC News. January 9, 2007〕 80% of the city's pollution is due to cars. The remaining 20% is due to industrial pollution. Other estimates suggest that motorcycles alone account for 30% of air and 50% of sound pollution in Tehran. In 2007, Iran imposed fuel rations but the plan has met little success in reducing the pollution levels. In 2011, with the improvements in the public transport system and the rise in fuel prices due to the new subsidies reform plan, the government is hoping to be able to improve the problems of pollution and traffic.〔(Turquoise Partners: Iran Investment Monthly (February 2011) ). Retrieved April 30, 2011〕 The air pollution is due to several different reasons: *Economical: most Iranian industries are located on the outskirts of Tehran. The city is also overrun with old and aging cars which do not meet today's emission regulations. Furthermore, Iran's busiest airport, Mehrabad International Airport, is located in the west of the city. *Most people are then obliged to either use private cars or hire taxis. This has created severe traffic congestion; *Gasoline quality: Due to international sanctions, the Iranian government allowed its refineries (designed to produce petrochemical products) to manufacture sub-par gasoline. *Geographical: Tehran is bound in the north by the massive Alborz mountain range that is stopping the flow of the humid Caspian wind. As a result, thermal inversion that traps Tehran's polluted air is frequently observed. The lack of humidity and clouds makes Tehran a very sunny city. The UV radiations then combined with the existing pollutants significantly raise the level of the ozone. In fact one of the urban landmarks in central Tehran is a giant air quality gauge.〔''The Huffington Post, "Tehran Air Pollution Keeps Iran's Capital Shut Down Amid 'Unbreathable' Smog", 12 December 2010〕 Furthermore, the reportedly poor quality of Iranian-manufactured gasoline may also be contributing to the pollution.〔''The Economist'', "The smoggiest of all capitals", 1 January 2011, p. 40.〕 However, the government is engaged in a battle to reduce air pollution. It has, for instance, encouraged taxis and buses to convert from petrol engines to engines that run on compressed natural gas. Furthermore, since 1979, the government has set up a "Traffic Zone" covering the city center during peak traffic hours. Entering and driving inside this zone is only allowed with a special permit. The government is also trying to raise people's awareness about the hazards of the pollution. One method that is currently being employed is the installation of Pollution Indicator Boards all around the city to monitor the current level of particulate matter (PM10), nitrogen dioxide (NO2), ozone (O3), sulfur dioxide (SO2), and carbon monoxide (CO). The board also displays the Pollutant Standards Index (PSI), which is a general indication of air quality based on the measurements of the above-mentioned five pollutants. The Pollution Indicator Boards classify the level of each pollutant as either safe, hazardous or dangerous. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Environmental issues in Tehran」の詳細全文を読む スポンサード リンク
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