# Difference in raw data archive and sensor map
**URL:** https://forum.sensor.community/t/difference-in-raw-data-archive-and-sensor-map/2472
**Category:** Uncategorized
**Created:** [December 4, 2023, 3:17pm UTC](https://forum.sensor.community/t/difference-in-raw-data-archive-and-sensor-map/2472 "2023-12-04T15:17:04Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Edwin](https://forum.sensor.community/u/Edwin)
#### Post date: [December 4, 2023, 3:17pm UTC](https://forum.sensor.community/t/difference-in-raw-data-archive-and-sensor-map/2472/1 "2023-12-04T15:17:04Z")
Hi all,
I downloaded the historical data of my pm-sensor to see if i could do some analyses. I noticed differences between the data in the downloaded csv-file, and the data shown on the sensor community map.
For example: the data in the csv-file shows the following data for last measurements of December 1st:
- PM10 at 23:56 = 18.7
- PM25 at 23:56 = 7.53
However, when I look at the data shown on the sensor community map, the values are as follows:
- PM10 at 23:56 = 21.4
- PM25 at 23:56 = 8.60
Does anybody know why there is a difference?
Thanks!
Edwin
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### Author:  [@Phaze-III](https://forum.sensor.community/u/Phaze-III)
#### Post date: [December 6, 2023, 4:34pm UTC](https://forum.sensor.community/t/difference-in-raw-data-archive-and-sensor-map/2472/2 "2023-12-06T16:34:01Z")
The raw data timestamps are in UTC, the map uses local time (+1 hour). You’ll see that the data in the csv at 22:56 will have the expected values.
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### Author:  [@Edwin](https://forum.sensor.community/u/Edwin)
#### Post date: [December 14, 2023, 4:04pm UTC](https://forum.sensor.community/t/difference-in-raw-data-archive-and-sensor-map/2472/3 "2023-12-14T16:04:41Z")
You’re right. Thanks for the help.