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    "en": "Carbon monoxide is a colourless, odourless gas that can be poisonous to humans and is considered a significant public health hazard (WHO, 1999). <br /> <p>WHO, 1999. <a href=\"https://wedocs.unep.org/bitstream/handle/20.500.11822/29538/EHC13CarbMoxide.pdf?sequence=1&amp;isAllowed=y\">Environmental Health Criteria 213: Carbon monoxide. Second Edition. International Programme on Chemical Safety, World Health Organization (WHO)</a>. Accessed 2 December 2019.</p>"
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      "Carbon monoxide (CO) is one of the most common and widely distributed air pollutants. It is a colourless, odourless and tasteless gas that is poorly soluble in water. Carbon monoxide has a slightly lower density than air. In the human body, it reacts readily with haemoglobin to form carboxyhaemoglobin. Small amounts of carbon monoxide are also produced endogenously. Carbon monoxide exposure is still one of the leading causes of unintentional and suicidal poisonings, and causes a large number of deaths annually (WHO, 2000). It is a product of the incomplete combustion of carbon-containing fuels and is also produced by natural processes or by biotransformation of halomethanes within the human body. With external exposure to additional carbon monoxide, subtle effects can begin to occur, and exposure to higher levels can result in serious symptoms and death. The health effects of carbon monoxide are largely the result of the formation of carboxyhaemoglobin (COHb), which impairs the oxygen-carrying capacity of the blood (WHO, 1999). The total annual global emissions of carbon monoxide into the atmosphere have been estimated to be as high as 2600 million tonnes, of which about 60% are from human activities and about 40% from natural processes. Anthropogenic emissions of carbon monoxide originate mainly from the incomplete combustion of carbonaceous materials. The largest proportion of these emissions are produced as exhaust gases from internal combustion engines, especially by motor vehicles with petrol engines. Other common sources include various industrial processes, power plants using coal, and waste incinerators. Petroleum-derived emissions have greatly increased over the past few decades. Some widespread natural non-biological and biological sources, such as plants, oceans and oxidation of hydrocarbons, give rise to the background concentrations outside urban areas. In indoor environments, space heaters fuelled with oil, gas or kerosene, gas stoves and some other combustion appliances (e.g., wood stoves), and tobacco smoking are also responsible for significant emissions of carbon monoxide (WHO, 2000)."
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