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The US-based Axon company, which developed the Taser used by the Brooklyn Center police department involved in this incident, was quoted as saying their weapons were designed to be distinguishable from handguns.

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Monitors show the highest concentrations of outdoor NO2 in large urban regions such as the Northeast corridor, Chicago and Los Angeles. Levels are higher on or near heavily traveled roadways.

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It had "implemented numerous features and training recommendations to reduce the possibility of these incidents occurring" - including making them look and feel different from a firearm.

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The Brooklyn Center police manual says officers need to be trained at least annually, and the training should include "performing reaction-hand draws or cross-draws to reduce the possibility of accidentally drawing and firing a firearm," according to Reuters news agency.

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As of 2020, human-made sources in the U.S. emit 7.64 million short tons of nitrogen oxides per year (down from 15 million short tons per year in 2011) mainly from burning fuels. Trucks, buses, and cars are the largest sources of NO2 emissions, followed by diesel-powered non-road equipment, industrial processes such as oil and gas production, industrial boilers and other movable engines, and coal-fired power plants. Emissions of nitrogen dioxide will decline as cleanup of many of these sources continue in future years.

It is important to note that NO2 and other nitrogen oxides are also produced from burning natural gas (methane), both outdoors and indoors. Outdoors, this can include gas-fired power plants and from facilities that extract, process or transport oil and gas if they burn it in flares or to power equipment. Indoors, appliances such as stoves, dryers and space heaters that burn natural gas, liquified petroleum gas (or LPG, which includes propane and butane) and kerosene can produce substantial amounts of nitrogen dioxide. If those appliances are not fully vented to the outside, levels of NO2 can build up to unhealthy levels indoors.

Police officers are typically trained to keep guns in a holster on their dominant side to avoid confusing it with their Taser, which is kept on the belt on the other side of the body.

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Nitrogen dioxide, or NO2, is a gaseous air pollutant composed of nitrogen and oxygen and is one of a group of related gases called nitrogen oxides, or NOx. Nitrogen dioxide forms when fossil fuels such as coal, oil, methane gas (natural gas) or diesel are burned at high temperatures. NO2 and other nitrogen oxides in the outdoor air contribute to particle pollution and to the chemical reactions that make ozone. It is one of six widespread air pollutants for which there are national air quality standards to limit their levels in the outdoor air. NO2 can also form indoors when fuels like wood or gas are burned.

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Tasers fire small dart-like electrodes that can deliver a high-voltage shock to disable temporarily a suspect and allow officers to deal with violent, or potentially violent, people at a distance.

The video of the incident that was circulated by police shows the officer shouting out "Taser, Taser, Taser" before shooting, and then appearing to realise she had used a handgun instead.

However, a law journal published in 2012 found nine examples of police officers accidentally using a handgun instead of a Taser between 2001 and 2009. Two of these incidents resulted in death.

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While everyone is at risk from health impacts of nitrogen dioxide pollution, those that live near the emission sources are at higher risk. Other vulnerable subpopulations at higher risk from nitrogen dioxide exposure include:

The Brooklyn Center police manual says that officers must position Tasers "in a reaction-side holster on the side opposite the duty weapon".

The officer has been named as Kim Potter, who had worked for Brooklyn Center Police for 26 years. She has resigned, and been charged with second-degree manslaughter.

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The good news is that for much of the nation, the outdoor air has much lower levels of nitrogen dioxide now than in previous decades. Under the federal Clean Air Act, more protective standards nationwide have helped drive down nitrogen dioxide emissions. Power plants, industrial sites and on-road vehicles are cleaner than they used to be, which has driven nationwide improvement in air quality. However, far too many people still breathe in unhealthy levels of nitrogen dioxide pollution.

But all three were cleared of the most serious counts that could have resulted in life in prison for the death of Tyre Nichols.

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A 2022 review of multiple studies found that elevated levels of NO2, as well as elevated particulate matter and sulfur dioxide, were strongly associated with heart and lung harm, affected pregnancy and birth outcomes, and were likely associated with increased risk of kidney and neurological harm, autoimmune disorders and cancer.

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Other experts point out that even if a Taser and a gun are holstered on different sides of the body, if they are both worn in a such a way that they can be easily accessed by the dominant hand, that could lead to mistakes when under pressure.

Our seven (7) day course includes theory and practical training in close protection, defence, bodyguard duties, responsibilities, threat identification.

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"So if you're right-handed you carry your firearm on your right side and [you] carry your Taser on your left," Brooklyn Center Police Chief Tim Gannon told reporters after the shooting of Mr Wright.

Individuals can take steps to protect themselves on days with unhealthy levels of air pollutants and also ask policymakers at all levels of government to continue to require cleanup of air pollution.

The killing of Daunte Wright, a young black man, in a suburb of Minneapolis in the US, was because an officer mistook her gun for a Taser, according to police.

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