Dear All
Thank you again for your assistance providing informetion. PurpleAir is a company that manufactures and distributes air quality sensors globally. The data collected by these sensors is made available to the public through their website and other platforms .When it comes to the validity of PurpleAir data, it is essential to understand that the accuracy and reliability of the data can vary.
can PurpleAir provides a data validation system that allows users to check the sensor’s calibration status and identify potential anomalies. is there any coefficient factors to convert the raw data which downloaded from the web to research use. i am waiting your respons soon.
Best
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Kindly request citations and the correlation coefficient of PM2.5
Best
Hi Andualem, the most common method for validating PurpleAir data is by collocating PurpleAir sensors with regulatory monitors. Much research has been done using this method. I’ll provide a few examples:
- PurpleAir PM2.5 performance across the U.S.#2 | Science Inventory | US EPA
- AMT - An evaluation of the U.S. EPA's correction equation for PurpleAir sensor data in smoke, dust, and wintertime urban pollution events
- Correction and Accuracy of PurpleAir PM2.5 Measurements for Extreme Wildfire Smoke - PMC
- Pollutants | Free Full-Text | Long-Term Assessment of PurpleAir Low-Cost Sensor for PM2.5 in California, USA
Additionally, all outdoor PurpleAir sensors include two laser counters, which allow us to compare the data from the two channels and create a measure of confidence. You can learn more about it here: What are Channel A and Channel B?
thank you, Andrew. Let me read it and reply if any clarity is needed.best
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hello
I have one question
how to interplate the missing data of hourly, daily,monthly if there Time_stam row is no blank or an
Hello My friend Josh how are you. I am fine. I thank you all for your help that you provide data for me. I want to ask you about the Temperature unit that I accessed from API. I asked last time about additional data from the station I stated, even for payment even though I am a student. moreover, the data is missing when manually inspected but has no blank or no rows, can you assist me with how to handle it?
Hi @Mengistu,
If you’re downloading empty files from the API or missing rows of data, it’s likely the sensor didn’t report any data for that time. Our How to Tell When A Sensor Produced Data article goes into further depth, and provides recommendations on how to determine when data is available for a sensor.