Carbon Dioxide Nitrogen Oxides Ozone Wind Power 
Union of Concerned Scientists
MARCH 23, 2023
In 2021 alone, the plants slated for retirement emitted more than 28,000 tonnes of nitrogen oxides (NO x ), 32,000 tonnes of sulfur dioxide (SO 2 ), and 51 million tonnes of carbon dioxide (CO 2 ), according to EIA data. NO x also contributes to the formation of ozone (or “smog”), another toxic pollutant.
Legal Planet
MARCH 6, 2023
Critically, and as we’ll discuss in greater depth shortly, hydrogen combustion (as opposed to its use in fuel cells) also leads to greater emissions of nitrogen oxides (NOx), a toxic group of pollutants regulated under the Clean Air Act. It is also a precursor to other pollutants, including ozone (a key component of smog).
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