# Map LRPA conversion help

**URL:** <https://community.purpleair.com/t/map-lrpa-conversion-help/6534>\
**Category:** Bug Reports\
**Created:** [September 19, 2023, 7:36pm UTC](https://community.purpleair.com/t/map-lrpa-conversion-help/6534 "2023-09-19T19:36:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![wawzat](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/wawzat/32/219_2.png) [@wawzat](https://community.purpleair.com/u/wawzat)\
**Post date:** [September 19, 2023, 7:36pm UTC](https://community.purpleair.com/t/map-lrpa-conversion-help/6534/1 "2023-09-19T19:36:10Z")

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The help for the LRPA conversion has a hyperlink for “study of the PA sensors” which results in a page not found error. Does anyone have a correct link for this? I’d link to read about how to implement this correction in my code.

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**Author:** ![dwhitemv](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/dwhitemv/32/1508_2.png) [@dwhitemv](https://community.purpleair.com/u/dwhitemv)\
**Post date:** [September 22, 2023, 5:14am UTC](https://community.purpleair.com/t/map-lrpa-conversion-help/6534/2 "2023-09-22T05:14:14Z")

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According to

> **[The Air Quality Index (AQI) Basics & Beyond | Lane Regional Air...](https://www.lrapa.org/aqi101/)**
>
> The physical environment is an important part of any person’s health and well-being. Understanding the quality of the air outside is the first step to avoiding exposure to harmful air \[…\]

LRAPA has discontinued its own conversion in preference to the US EPA conversion.  
The old conversion was, in pseudocode:

```auto
IF (pm <= 65) THEN MAX(((0.5 * pm) - 0.66), 0) 
ELSE pm 
END IF

```

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<div class="post-metadata">

**Author:** ![wawzat](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/wawzat/32/219_2.png) [@wawzat](https://community.purpleair.com/u/wawzat)\
**Post date:** [September 25, 2023, 5:21pm UTC](https://community.purpleair.com/t/map-lrpa-conversion-help/6534/3 "2023-09-25T17:21:09Z")

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Doug, thank you so much for taking the time to reply. This is very helpful.