Which gas has a legal limit of 3 parts per million (ppm)?

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Multiple Choice

Which gas has a legal limit of 3 parts per million (ppm)?

Explanation:
Exposure limits for gases are given as concentrations in the air, often in parts per million (ppm). The value 3 ppm is a standard limit used for certain toxic gases. Among the options, nitrogen dioxide is the one specified with a 3 ppm limit, so it’s the correct match. The others use different formats or values: carbon dioxide is shown as a percentage (1.25%), which translates to a much higher ppm value and isn’t 3 ppm; sulfur dioxide is limited to 2 ppm; methane is limited to 1 ppm.

Exposure limits for gases are given as concentrations in the air, often in parts per million (ppm). The value 3 ppm is a standard limit used for certain toxic gases. Among the options, nitrogen dioxide is the one specified with a 3 ppm limit, so it’s the correct match. The others use different formats or values: carbon dioxide is shown as a percentage (1.25%), which translates to a much higher ppm value and isn’t 3 ppm; sulfur dioxide is limited to 2 ppm; methane is limited to 1 ppm.

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