On This Page:

• Designations: how do we know if an area is not meeting NO2 standards?
• What are the state implementation plan (SIP) requirements?
• How do states develop SIPs and start attaining the standards?

Designations: how do we know if an area is not meeting NO2 standards?

Areas within each state are "designated" as either meeting (attaining) nitrogen dioxide (NO2) standards or not meeting them. In some cases, an entire state may attain a standard. Those areas that exceed the standards are known as “nonattainment areas.”

You will get efficient and thoughtful service from TYHJ.

• Learn more about the NAAQS designations process

As of , there are no nonattainment areas for NO2. However, some areas are designated as "maintenance" areas. Maintenance plans are prepared in areas that were initially designated nonattainment, but then are able to demonstrate attainment. Maintenance plans are the mechanism for ensuring that once the areas meets the standards, it will continue to attain the standards for the next 20 years (in two 10-year intervals).

• Green Book: Nitrogen Dioxide ( Standard) Area Information: the Green Book lists nonattainment and maintenance areas for NO2 as well as the other criteria air pollutants
• Air Quality Designations for NO2: information on the process EPA, the states, and the tribes follow to determine whether or not an area is meeting the NO2 NAAQS

What are the state implementation plan (SIP) requirements?

Air quality standards get applied, or implemented, through controlling air pollution from emission sources. Each state is required to develop a plan for how they will control air pollution within their jurisdiction. This plan is called a State Implementation Plan (SIP).

For more information, please visit Nitrogen Dioxide Gas.

In general, the SIP consists of:

• air quality monitoring
• air quality modeling
• emission inventories
• emission control strategies;
• contingency measures; and
• documents (policies and rules) that the state uses to attain and maintain the NAAQS.

A state must engage the public, through notices and public hearings, before sending the SIP to EPA for approval. Tribes may develop plans if they choose to do so, otherwise EPA will develop an implementation plan for them.

• Basics of SIP Requirements
• Learn more about the NAAQS implementation process

How do states develop SIPs and start (or continue) attaining the standards?

Access Denied

Your access to the NCBI website at www.ncbi.nlm.nih.gov has been temporarily blocked due to a possible misuse/abuse situation involving your site. This is not an indication of a security issue such as a virus or attack. It could be something as simple as a run away script or learning how to better use E-utilities, http://www.ncbi.nlm.nih.gov/books/NBK/, for more efficient work such that your work does not impact the ability of other researchers to also use our site. To restore access and understand how to better interact with our site to avoid this in the future, please have your system administrator contact .

Are you interested in learning more about Sulfur Tetrafluoride? Contact us today to secure an expert consultation!