Talk:National Ambient Air Quality Standards

United States: Government Low‑importance

	United States portal This article is within the scope of WikiProject United States, a collaborative effort to improve the coverage of topics relating to the United States of America on Wikipedia. If you would like to participate, please visit the project page, where you can join the ongoing discussions. Template Usage Articles Requested! Become a Member Project Talk Alerts United StatesWikipedia:WikiProject United StatesTemplate:WikiProject United StatesUnited States
Low	This article has been rated as Low-importance on the project's importance scale.
	This article is supported by WikiProject U.S. Government (assessed as Low-importance).

Law Low‑importance

	Law portal This article is within the scope of WikiProject Law, an attempt at providing a comprehensive, standardised, pan-jurisdictional and up-to-date resource for the legal field and the subjects encompassed by it.LawWikipedia:WikiProject LawTemplate:WikiProject Lawlaw
Low	This article has been rated as Low-importance on the project's importance scale.

Environment: Environmental Record Mid‑importance

	Environment portal This environment-related article is part of the WikiProject Environment to improve Wikipedia's coverage of the environment. The aim is to write neutral and well-referenced articles on environment-related topics, as well as to ensure that environment articles are properly categorized. Read Wikipedia:Contributing FAQ and leave any messages at the project talk page.EnvironmentWikipedia:WikiProject EnvironmentTemplate:WikiProject EnvironmentEnvironment
Mid	This article has been rated as Mid-importance on the project's importance scale.
	This article is supported by the Environmental Record task force.

Why not include the entire standard?

e.g., here is the

National primary ambient air quality standards for sulfur oxides (sulfur dioxide).

§ 50.17

(a) The level of the national primary 1-hour annual ambient air quality standard for oxides of sulfur is 75 parts per billion (ppb, which is 1 part in 1,000,000,000), measured in the ambient air as sulfur dioxide (SO2).

(b) The 1-hour primary standard is met at an ambient air quality monitoring site when the three-year average of the annual (99th percentile) of the daily maximum 1-hour average concentrations is less than or equal to 75 ppb, as determined in accordance with appendix T of this part.

(c) The level of the standard shall be measured by a reference method based on appendix A or A-1 of this part, or by a Federal Equivalent Method (FEM) designated in accordance with part 53 of this chapter.

[75 FR 35592, June 22, 2010]

The standards are omitted for oxides of nitrogen (other than NO2)

The article currently cites only the secondary limit, 0.053 parts per million (53 parts per billion) of nitrogen dioxide and omits the primary limits on oxides of nitrogen.

The cited legal authority specifies limits for "oxides of nitrogen" measured in parts per billion, including a

primary limit of one-hour standard of 100 ppb and

primary limit of an annual average of 53 ppb.

So, could there be value in including the primary limits?

Here's the law cited

CFR Title 40 - Protection of Environment (2017) (Accessed 2018 July 31)

https://www.gpo.gov/fdsys/pkg/CFR-2017-title40-vol2/xml/CFR-2017-title40-vol2-sec50-11.xml

§ 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).

(a) The level of the national primary annual ambient air quality standard for oxides of nitrogen is 53 parts per billion (ppb, which is 1 part in 1,000,000,000), annual average concentration, measured in the ambient air as nitrogen dioxide.

(b) The level of the national primary 1-hour ambient air quality standard for oxides of nitrogen is 100 ppb, 1-hour average concentration, measured in the ambient air as nitrogen dioxide.

(c) The level of the national secondary ambient air quality standard for nitrogen dioxide is 0.053 parts per million (100 micrograms per cubic meter), annual arithmetic mean concentration.

Ocdcntx (talk) 15:43, 31 July 2018 (UTC)[reply]