# Latest **URL:** https://forum.airnowtech.org/latest.md [Latest](https://forum.airnowtech.org/latest.md) · [Categories](https://forum.airnowtech.org/categories.md) · [Tags](https://forum.airnowtech.org/tags.md) --- ## [Discontinuation of EPA generated forecast on public air now map](https://forum.airnowtech.org/t/discontinuation-of-epa-generated-forecast-on-public-air-now-map/569)
**Author:** [@jgering](https://forum.airnowtech.org/u/jgering)\ **Replies:** 3\ **Last updated:** [September 15, 2026, 12:48pm UTC](https://forum.airnowtech.org/t/discontinuation-of-epa-generated-forecast-on-public-air-now-map/569 "2026-09-15T12:48:41Z")
Some time ago (maybe 1 or 2 years ago) the automatically generated forecasts on the AirNow.gov map were discontinued. Is there an EPA-generated forecast feed that we can use to automatically generate a forecast for Iowa… --- ## [The NowCast for PM2.5 and PM10](https://forum.airnowtech.org/t/the-nowcast-for-pm2-5-and-pm10/172)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 15, 2016, 9:28pm UTC](https://forum.airnowtech.org/t/the-nowcast-for-pm2-5-and-pm10/172 "2016-07-15T21:28:57Z")
Nowcast Overview From the EPA’s AQI Technical Assistance Document page 7: EPA uses the NowCast to approximate the complete daily AQI during any given hour. Even on days when the AQI forecast predicts unhealthy conditi… --- ## [The AQI Equation](https://forum.airnowtech.org/t/the-aqi-equation/169)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 5, 2016, 10:37pm UTC](https://forum.airnowtech.org/t/the-aqi-equation/169 "2016-07-05T22:37:44Z")
AQI Equation Where Conci = Input concentration for a given pollutant ConcLo = The concentration breakpoint that is less than or equal to Conci ConcHi = The concentration breakpoint that is greater than or equal to C… --- ## [The Nowcast for Ozone - 2019 Update (Partial Least Squares Method)](https://forum.airnowtech.org/t/the-nowcast-for-ozone-2019-update-partial-least-squares-method/356)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 26, 2019, 1:54pm UTC](https://forum.airnowtech.org/t/the-nowcast-for-ozone-2019-update-partial-least-squares-method/356 "2019-07-26T13:54:08Z")
On August 1, 2019, the AirNow Data Management Center implemented a new EPA method for calculating the ozone Nowcast using a Partial Least Squares (PLS) method. All relevant R code and corresponding white paper cited in t… --- ## [Daily and Hourly AQI - PM10](https://forum.airnowtech.org/t/daily-and-hourly-aqi-pm10/263)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [April 10, 2018, 9:22pm UTC](https://forum.airnowtech.org/t/daily-and-hourly-aqi-pm10/263 "2018-04-10T21:22:14Z")
Daily PM10 AQI The daily PM10 AQI is calculated by taking the 24-hour concentration average from midnight to midnight (Local Standard Time) and converting to AQI using the PM10 cutpoints. 75%, or 18/24 hours of data are… --- ## [Daily and Hourly AQI - Ozone](https://forum.airnowtech.org/t/daily-and-hourly-aqi-ozone/170)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 5, 2016, 10:48pm UTC](https://forum.airnowtech.org/t/daily-and-hourly-aqi-ozone/170 "2016-07-05T22:48:18Z")
Daily Ozone AQI The daily ozone AQI is calculated by taking the maximum 8 hour concentration from 07:00-23:00 LST, and then converting to AQI. Each 8-hour average concentration is truncated to .001ppm/1ppb. There are 17 … --- ## [Daily and Hourly AQI - PM2.5](https://forum.airnowtech.org/t/daily-and-hourly-aqi-pm2-5/171)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 5, 2016, 10:56pm UTC](https://forum.airnowtech.org/t/daily-and-hourly-aqi-pm2-5/171 "2016-07-05T22:56:37Z")
Daily PM2.5 AQI The daily PM2.5 AQI is calculated by taking the 24-hour concentration average from midnight to midnight (Local Standard Time) and converting to AQI using the PM2.5 cutpoints. 75%, or 18/24 hours of data a… --- ## [The AQI Equation (2024 - Valid Beginning May 6th, 2024)](https://forum.airnowtech.org/t/the-aqi-equation-2024-valid-beginning-may-6th-2024/453)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [March 18, 2024, 12:24pm UTC](https://forum.airnowtech.org/t/the-aqi-equation-2024-valid-beginning-may-6th-2024/453 "2024-03-18T12:24:27Z")
AQI Equation Where Conci = Input concentration for a given pollutant ConcLo = The concentration breakpoint that is less than or equal to Conci ConcHi = The concentration breakpoint that is greater than or equal to C… --- ## [Forecasting Ozone and PM concentrations from AQI values](https://forum.airnowtech.org/t/forecasting-ozone-and-pm-concentrations-from-aqi-values/439)
**Author:** [@rvr5005](https://forum.airnowtech.org/u/rvr5005)\ **Replies:** 1\ **Last updated:** [April 18, 2023, 1:26pm UTC](https://forum.airnowtech.org/t/forecasting-ozone-and-pm-concentrations-from-aqi-values/439 "2023-04-18T13:26:46Z")
I use an in-house AQ model using regression statistics (that I did not develop myself) and need to better understand the formulas used. If anyone has any input on the formula pasted below I would greatly appreciate it. … --- ## [Daily and Hourly AQI – Other Pollutants](https://forum.airnowtech.org/t/daily-and-hourly-aqi-other-pollutants/432)
**Author:** [@atutterow](https://forum.airnowtech.org/u/atutterow)\ **Replies:** 0\ **Last updated:** [November 16, 2022, 3:26pm UTC](https://forum.airnowtech.org/t/daily-and-hourly-aqi-other-pollutants/432 "2022-11-16T15:26:10Z")
Daily AQI SO2 Daily SO2 concentrations are based on the 24-hr average. 75%, or 18/24 hours of data are needed for a valid daily concentration. Please note that AirNow does not currently report daily AQI for SO2. If neede… --- ## [How do I update the action day name for AirNow to use?](https://forum.airnowtech.org/t/how-do-i-update-the-action-day-name-for-airnow-to-use/60)
**Author:** [@nlaguardia](https://forum.airnowtech.org/u/nlaguardia)\ **Replies:** 0\ **Last updated:** [May 7, 2015, 8:20pm UTC](https://forum.airnowtech.org/t/how-do-i-update-the-action-day-name-for-airnow-to-use/60 "2015-05-07T20:20:41Z")
To update the action day name for AirNow to use for a particular reporting area, you must be a user from the agency responsible for that reporting area in the AirNow system and have the Forecaster user role on the AirNow… --- ## [How do I add a new forecast city or reporting area to AirNow?](https://forum.airnowtech.org/t/how-do-i-add-a-new-forecast-city-or-reporting-area-to-airnow/51)
**Author:** [@nlaguardia](https://forum.airnowtech.org/u/nlaguardia)\ **Replies:** 0\ **Last updated:** [May 7, 2015, 8:05pm UTC](https://forum.airnowtech.org/t/how-do-i-add-a-new-forecast-city-or-reporting-area-to-airnow/51 "2015-05-07T20:05:03Z")
Email Info@airnowtech.org with the following information for each new forecast city or reporting area: Name of the forecast city or reporting area. Central coordinates (latitude and longitude) that are representative o… --- ## [Why is my city not showing up on AirNow.gov under cities with Action Days?](https://forum.airnowtech.org/t/why-is-my-city-not-showing-up-on-airnow-gov-under-cities-with-action-days/67)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 24, 2015, 9:15pm UTC](https://forum.airnowtech.org/t/why-is-my-city-not-showing-up-on-airnow-gov-under-cities-with-action-days/67 "2015-07-24T21:15:40Z")
AirNow Action Days names are listed on AirNow.gov. Action day names for AirNow reporting areas are defined upon creation of the reporting area in the system. After creation, they can be set from the Forecast tab on the … --- ## [What is a reporting area?](https://forum.airnowtech.org/t/what-is-a-reporting-area/109)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [November 12, 2015, 11:54pm UTC](https://forum.airnowtech.org/t/what-is-a-reporting-area/109 "2015-11-12T23:54:56Z")
Reporting areas, or forecast cities, are the means in which observations and forecast information is disseminated on AirNow.gov, and are required before a forecast can be issued. The participating air quality entities in… --- ## [What are verification sites and how do I specify them?](https://forum.airnowtech.org/t/what-are-verification-sites-and-how-do-i-specify-them/110)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [December 28, 2015, 9:41pm UTC](https://forum.airnowtech.org/t/what-are-verification-sites-and-how-do-i-specify-them/110 "2015-12-28T21:41:11Z")
What is a Verification Site? Verification sites are individual monitoring sites that are assigned to existing AirNow reporting areas. The data reported from the assigned verification sites are used to calculate the NowCa… --- ## [How do I set up and manage email alerts for my sites?](https://forum.airnowtech.org/t/how-do-i-set-up-and-manage-email-alerts-for-my-sites/102)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [November 6, 2015, 11:28pm UTC](https://forum.airnowtech.org/t/how-do-i-set-up-and-manage-email-alerts-for-my-sites/102 "2015-11-06T23:28:41Z")
To view or set up email alerts for a site within your agency, log in to your AirNow-Tech account and move your mouse over the Tools tab at the top right of the page. From the dropdown menu, select Alerts. From the Al… --- ## [Enviroflash- Agency Start-Up Guide](https://forum.airnowtech.org/t/enviroflash-agency-start-up-guide/111)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [December 31, 2015, 7:42pm UTC](https://forum.airnowtech.org/t/enviroflash-agency-start-up-guide/111 "2015-12-31T19:42:33Z")
What is EnviroFlash? EnviroFlash is a free, automated service that provides daily air quality forecasts via email to individuals who sign up to receive them. The EnviroFlash system allows each air quality agency to brand… --- ## [AirNow-Tech Improvements and Updated Ozone AQI Cut Points](https://forum.airnowtech.org/t/airnow-tech-improvements-and-updated-ozone-aqi-cut-points/112)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [January 29, 2016, 5:57pm UTC](https://forum.airnowtech.org/t/airnow-tech-improvements-and-updated-ozone-aqi-cut-points/112 "2016-01-29T17:57:35Z")
The EPA and the AirNow Data Management Center (DMC) have released improvements to AirNow-Tech. These updates include My Dashboard (Beta), available through the Dashboard drop-down menu. Allows viewing of current report… --- ## [AirNow API FTP To Be Discontinued in early 2017](https://forum.airnowtech.org/t/airnow-api-ftp-to-be-discontinued-in-early-2017/201)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [March 23, 2017, 5:25pm UTC](https://forum.airnowtech.org/t/airnow-api-ftp-to-be-discontinued-in-early-2017/201 "2017-03-23T17:25:05Z")
The AirNow Data Management Center (DMC) will be moving all files currently located on the FTP server (ftp://ftp.airnowapi.org/ ) to our new location: https://files.airnowtech.org/ Please make appropriate changes to any… --- ## [How can I obtain access to the EnviroFlash administrative pages for an existing AirNow-Tech account?](https://forum.airnowtech.org/t/how-can-i-obtain-access-to-the-enviroflash-administrative-pages-for-an-existing-airnow-tech-account/76)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 29, 2015, 8:35pm UTC](https://forum.airnowtech.org/t/how-can-i-obtain-access-to-the-enviroflash-administrative-pages-for-an-existing-airnow-tech-account/76 "2015-07-29T20:35:14Z")
Please email Info@airnowtech.org to request access for administrative rights in EnviroFlash. --- ## [I'm signed up for EnviroFlash but am not receiving my email alerts. What gives?](https://forum.airnowtech.org/t/im-signed-up-for-enviroflash-but-am-not-receiving-my-email-alerts-what-gives/64)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [July 24, 2015, 9:12pm UTC](https://forum.airnowtech.org/t/im-signed-up-for-enviroflash-but-am-not-receiving-my-email-alerts-what-gives/64 "2015-07-24T21:12:27Z")
Not receiving your EnviroFlash email, whether for daily forecasts or alert days, is usually caused by one of the following reasons. 1. You have not confirmed your subscription for air quality notifications If you have … --- ## [The NowCast for Ozone (obsolete as of 08/01/2019)](https://forum.airnowtech.org/t/the-nowcast-for-ozone-obsolete-as-of-08-01-2019/264)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [April 10, 2018, 10:13pm UTC](https://forum.airnowtech.org/t/the-nowcast-for-ozone-obsolete-as-of-08-01-2019/264 "2018-04-10T22:13:27Z")
IMPORTANT: As of 08/01/2019 This is no longer the NowCast method used for ozone. See information on the new method here Nowcast Overview From the EPA’s AQI Technical Assistance Document page 7: EPA uses the NowCast to… --- ## [Cross-origin Resource Sharing](https://forum.airnowtech.org/t/cross-origin-resource-sharing/306)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [October 17, 2018, 10:11pm UTC](https://forum.airnowtech.org/t/cross-origin-resource-sharing/306 "2018-10-17T22:11:45Z")
The AirNow API has CORS disabled to prevent direct website access to the API. Currently, there is no plan to enable CORS , so we recommend that users who want to use the data provided by the API in a web application take… --- ## [Who benefits from this community?](https://forum.airnowtech.org/t/who-benefits-from-this-community/212)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [August 2, 2017, 11:53pm UTC](https://forum.airnowtech.org/t/who-benefits-from-this-community/212 "2017-08-02T23:53:52Z")
Organizations interested in the installation of the AirNow-I or parts of it. Organizations interested in data sharing and collaboration in air quality and forecasting tools, sharing technical expertise and resources an… --- ## [What is the AirNow International Community?](https://forum.airnowtech.org/t/what-is-the-airnow-international-community/211)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [August 2, 2017, 11:53pm UTC](https://forum.airnowtech.org/t/what-is-the-airnow-international-community/211 "2017-08-02T23:53:02Z")
The AirNow-International (AirNow-I) Community is a network of agencies and international organizations interested in sharing and disseminating real-time air quality data and information. The AirNow-I community is adminis… --- ## [What are the AirNow-I system features?](https://forum.airnowtech.org/t/what-are-the-airnow-i-system-features/210)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [August 2, 2017, 11:47pm UTC](https://forum.airnowtech.org/t/what-are-the-airnow-i-system-features/210 "2017-08-02T23:47:53Z")
AirNow-International allows you to manage, access, and track your real-time air quality data with a proven, effective system that can be customized to meet your organization’s needs. The Data Management System (DMS) allo… --- ## [How can my country or organization benefit from using the AirNow-I system?](https://forum.airnowtech.org/t/how-can-my-country-or-organization-benefit-from-using-the-airnow-i-system/209)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [August 2, 2017, 11:45pm UTC](https://forum.airnowtech.org/t/how-can-my-country-or-organization-benefit-from-using-the-airnow-i-system/209 "2017-08-02T23:45:02Z")
Help protect public health with air quality alerts when air pollution is high Help determine the best air quality control measures for your region. These could include: No-drive days and other traffic controls; Pedest… --- ## [Who are the AirNow International partners?](https://forum.airnowtech.org/t/who-are-the-airnow-international-partners/208)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [August 2, 2017, 11:42pm UTC](https://forum.airnowtech.org/t/who-are-the-airnow-international-partners/208 "2017-08-02T23:42:09Z")
Operating Partners China: Shanghai 2010, Zhejiang Province 2013 Mexico: Monterrey 2012; Mexico City 2014; Guanajuato, Jalisco and Guadalajara 2015 Collaborating Partners Canada 2000 Taiwan 2014 (AirNow-Tech) AirNow P… --- ## [What is AirNow International?](https://forum.airnowtech.org/t/what-is-airnow-international/207)
**Author:** [@alanc](https://forum.airnowtech.org/u/alanc)\ **Replies:** 0\ **Last updated:** [August 2, 2017, 11:39pm UTC](https://forum.airnowtech.org/t/what-is-airnow-international/207 "2017-08-02T23:39:08Z")
AirNow-International (AirNow-I) is a stand-alone, international version of the U.S. Environmental Protection Agency’s (EPA) real-time air quality data management and display system known as AirNow. AirNow-I includes a su… --- ## [Automatically grabbing files on files.airnowtech.org](https://forum.airnowtech.org/t/automatically-grabbing-files-on-files-airnowtech-org/204)
**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\ **Replies:** 0\ **Last updated:** [May 2, 2017, 5:54pm UTC](https://forum.airnowtech.org/t/automatically-grabbing-files-on-files-airnowtech-org/204 "2017-05-02T17:54:14Z")
Within the next month, ftp://ftp.airnowapi.org/ will be discontinued, replaced by the amazon s3 server files.airnowtech.org. Many users will need to update their scripts to grab data from the new location. Note that th… [Next page](https://forum.airnowtech.org/latest.md?page=1)