![]() ![]() The app detects the nearest sensor to you and displays some basic data for the PM2.5 concentration in real-time. Return to the top of the page and enter the desired date range, then click Download SelectedĪlthough PurpleAir currently does not have an app, there is a free iOS app called Local Haze which supports PurpleAir’s monitors.Find and mark the sensor/s in the list you want to download – use CTRL + F to quickly search by sensor name.(An airshed is a part of the atmosphere that behaves in a coherent way with respect to the dispersion of emissions.) PurpleAir Portal on Firefoxįinally, users can download the measurements from their sensor and from other sensors as well in a. The conversions help accommodate different types of pollution with different particle densities and for specific airsheds. It supports the US EPA AQI standards and Canadian AQHI standards and raw PM1, PM2.5 and PM10 data in μg/m³ with conversions to AQandU and LRAPA. However, you can’t see real-time Temperature and Humidity and PM2.5… values all together unless you choose different Map Data Layer each time. On the other hand on Firefox and Chrome the information is presented in more clean way and there is an option to download a PNG/JPG/PDF/SVG file of the graph something that it isn’t possible on Safari. Safari doesn’t support well WebGL API and the company has been forced to develop a different version of the map. For example, on Safari we can see on the left the map and on the right of the screen the Real-Time AQI, Trends, Temperature/Humidity, a lot of tabs to choose between and even a graph which compares the sensor A and B. The web site will provide a different version of the Map to the users depending the web browser you are using. One way is to access the real-time data through a soft-AP IP address the router creates when the device connects to it and another way to access the data is through the online portal map at Soft Access Point The end-user has two ways to access the data. When you register the device for the first time there are a lot of options to consider, like if you want the data to stay private or public (please, allow others to see the air quality in your area), the location of the device, Data Processors such as the Weather Underground or your own server and some contact info. This is the reason the device doesn’t offer a lot of configuration options rather than the Wi-Fi and there isn’t an option to change the Temperature from ✯ Fahrenheit to ✬ Celsius yet. The ESP8266 has a limited internal memory typically of 4MB and the software of the device becomes very limited too, at least locally. As a result readings are affected by the electronics so temperature may be elevated and humidity under estimated. The BME280 is a small SMD sensor made by Bosch which can measure Temperature, Humidity and Pressure. The sensor is reporting conditions inside the sensor housing, not ambient conditions. These results are very good, a closer value to R²=1 means that the device is as good as a US$25,000 instrument (MetOne BAM FEM). On a different technical evaluation, which was done by the San Joaquin Valley Air Pollution Control District, they found a correlation of R² ∼ 0.83 on a 24-hour average comparison ( full evaluation). PM 10 sensor measurements correlated well with the corresponding GRIMM and FEM BAM values ( R² >0.68 and R² > 0.60) (1-hr average).PM 2.5 sensor data correlated very well with the corresponding FEM GRIMM and FEM BAM values ( R² > 0.93 and R² > 0.86) and were quite accurate.PM 1.0 sensor data correlated very well ( R²> 0.96) with the corresponding values collected using a substantially more expensive particle instrument (GRIMM) and were quite accurate.Readings are then uploaded to the cloud every 80 seconds or so where they are stored for download and display on the PurpleAir map.Ī field evaluation has been conducted by the SCAQMD in which two Federal Equivalent Method were used (BAM & GRIMM) and they found the following results ( full evaluation): The estimated total mass for PM1.0, PM2.5 and PM10 is averaged by the PurpleAir Internet of Things (IoT) control board. *Optional SD Card Slot and Real Time Clock.BME280 Temperature, Humidity and Pressure sensor.Built in WiFi for logging to “The Cloud” WiFi 802.11 b/g/n 2.4 GHz | WPA/WPA2.Both of them work together to establish better results and a coefficient of determination ( R²). The monitor is very compact and it can be easily distinguished from the rest because it has 2 Particulate Matter sensors. A reader of the blog took the initiative to establish a contact between PurpleAir and me, as a result the PurpleAir II outdoor Particulate Matter monitor is here for a review. ![]()
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