# Ozone

**URL:** https://forum.airnowtech.org/c/aqi/ozone/30.md

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## [About the Ozone category](https://forum.airnowtech.org/t/about-the-ozone-category/258)

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**Author:** [@mwhylton](https://forum.airnowtech.org/u/mwhylton)\
**Replies:** 0

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## [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)

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**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")

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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…

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## [Daily and Hourly AQI - Ozone](https://forum.airnowtech.org/t/daily-and-hourly-aqi-ozone/170)

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**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")

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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 …

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## [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)

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**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")

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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…