Do you have outdoor air monitoring data for all counties in the U.S.?
No, approximately 1,000 out of the roughly 3,000 U.S. counties have monitoring data. Return to Frequent Questions about AirData
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
No, approximately 1,000 out of the roughly 3,000 U.S. counties have monitoring data. Return to Frequent Questions about AirData
We don't aggregate concentration data at a state level, primarily because it can, and does, vary widely across any given state. That's why you see monitor-level, county-level, and CBSA-level aggregates on the website. Return to Frequent Questions about AirData
Refer to the AQI Technical Assistance Document for equations on how to calculate the AQI from pollutant concentration. Return to Frequent Questions about AirData
States typically decide where monitors are placed based on areas of relatively high population and/or areas believed to have relatively higher pollutant concentrations. Each state is responsible for developing its own monitoring plan, which is then reviewed and revised every five years. Follow this link for guidance on state and…
POC is the Parameter Occurrence Code and is used to uniquely identify a monitor if there is more than one device measuring the same pollutant at a site. The POC number assignment is somewhat arbitrary and varies between sites that are maintained by different state and local agencies. POC designation…
Individuals or groups wishing to sponsor training courses for disciplines required to be accredited under section 206(b)(1)(A) of the Toxic Substances Control Act (TSCA) may apply for approval from states that have accreditation program requirements that are at least as stringent as the EPA Asbestos Model Accreditation Plan (MAP). For…
How does a new Preparer get access to a Risk Management Plan (RMP) via RMP*eSubmit? First, the person must register with CDX. To register with CDX, go to https://cdx.epa.gov/ and complete the registration process for a Risk Management Plan “Preparer”. Once set up as a “Preparer”, the Certifying Official needs…
What if I leased some parcels, and there are tanks already present? Am I responsible for these tanks? You could be. If you plan to use these tanks, make sure in your lease agreement, it states who is responsible for these tanks. If the lease does not state who is…
Pursuant to the Emergency Planning and Community Act (EPCRA) Section 312, facilities must submit by March 1st every year Tier II inventory information regarding any hazardous chemical present at their facility at any time during the previous calendar year in an amount equal to or in excess of its threshold…
A facility has 9,000 pounds of ammonium hydroxide (19 percent solution) present on site at a given time. For reporting under the Emergency Planning and Community Right-to-Know Act (EPCRA) section 312, must the amount of ammonia in ammonium hydroxide be counted (and aggregated) towards the reporting threshold for extremely hazardous…
See More Frequent Questions about MOVES and Related Models. The MOVES model can estimate emissions at national, county or project scale. Project scale is useful for estimating an individual transportation project like an intersection or transit project, but it requires detailed inputs that describing the vehicle population and activity at…
For further information on formaldehyde and consumer products, call the EPA Toxic Substance Control Act (TSCA) Assistance Line (202) 554-1404. Sources of formaldehyde in the home include building materials, smoking, household products, and the use of un-vented, fuel-burning appliances, like gas stoves or kerosene space heaters. Formaldehyde, by itself or…
Carpet use in schools provides a decrease in noise, falls, and injuries. IAQ problems can be encountered with carpet and many other materials if the school has any type of water intrusion or moisture problem, such as a leaky roof. If carpeting remains damp, it can become a primary source…
Ten Things You Should Know About Mold: Potential health effects and symptoms associated with mold exposures include allergic reactions, asthma, and other respiratory complaints. There is no practical way to eliminate all mold and mold spores in the indoor environment; the way to control indoor mold growth is to control…
Molds are usually not a problem indoors, unless mold spores land on a wet or damp spot and begin growing. Molds have the potential to cause health problems. Molds produce allergens (substances that can cause allergic reactions), irritants, and in some cases, potentially toxic substances (mycotoxins). Inhaling or touching mold…