PurpleAir uses PMS5003 and PMS1003 laser particle counters. These sensors count suspended particles in sizes of 0.3, 0.5, 1.0, 2.5, 5.0, and 10um. These particle counts are processed by the sensor using a complex algorithm to calculate the PM1.
Where do PurpleAir sensors come from?
Users of PurpleAir can toggle between real-time data and readings averaged over the last 10 or 30 minutes. The data comes from the commercial sensors the company sells, which members of the public install on porches, yards and other neighborhood sites.
How does a PurpleAir sensor work?
How do PurpleAir sensors work? PurpleAir sensors use PMSX003 laser counters to measure particulate matter in real time, with each laser counter alternating 5-second readings averaged over 120 seconds. Each laser counter uses a fan to draw a sample of air past a laser beam.
How long do PurpleAir sensors?
The sensor is yours to keep! We ask that the sensor be installed for at least two years but we would appreciate it if you could keep the sensor plugged in for as long as possible.
How many PurpleAir sensors are there?
Purple Air has two sensors, which are both graphed on the timeseries. If the sensors are reading differently, very low, or very high, then one or both may be broken. You can see current air quality data on our website.
How accurate are PurpleAir sensors?
For the national data set of sensors collocated with regulatory-grade monitors, results show that PurpleAir sensors, when corrected, accurately report NowCast AQI categories 90% of the time as opposed to uncorrected PurpleAir data, which are accurate only 75% of the time.
What AQI is unhealthy?
An AQI over 150 is considered unhealthy for the general population. AQI over 101 can be unhealthy for sensitive groups and some workers with asthma and other conditions may feel unhealthy when the AQI is below 150.
Why is purple air different than AirNow?
Why does the AirNow Fire and Smoke Map look different than the PurpleAir Map? … AirNow identifies potentially malfunctioning sensors based on a comparison of readings from the two fine particle sensors each PurpleAIr sensor contains, or from user reports.
What is Lrapa air quality purple air?
LRAPA has deployed a network of low-cost air quality Purple Air sensors throughout Lane County. The Purple Air sensors provide particulate matter (PM) data in communities without regulatory monitors.
What does Lrapa mean on PurpleAir?
LRAPA PurpleAir Monitor Correction Factor History. In 2017 Lane Regional Air Protection Agency (LRAPA) began investigating the idea of using low-cost particulate matter (PM) sensors to supplement our PM2. 5 monitoring network and as a possible tool for use by citizens concerned about the PM levels in their neighborhood …
CONTINUE READING BELOW
Why should I buy a PurpleAir sensor?
Real-time air quality monitoring for people who care about the air. PurpleAir makes sensors that a community of citizen scientists use to collect hyper-local, real-time air quality data and share it on a map that is accessible to everyone.
Which air quality Site is most accurate?
Airnow.gov is the gold standard when it comes to knowing the precise measurement of pm 2.5.
Does PurpleAir have an app?
Although PurpleAir currently does not have an app, there is a free iOS app called Local Haze which supports PurpleAir’s monitors. The app detects the nearest sensor to you and displays some basic data for the PM2. 5 concentration in real-time.
What is a PM2 5 detector?
WITNESS real-time, reliable measurement of PM2. … (PM2. 5 refers to particles that are 2.5 microns or smaller in diameter.) This sensor uses laser scattering to radiate suspending particles in the air, then collects scattering light to obtain the curve of scattering light change with time.
How accurate is BreezoMeter?
By using sophisticated algorithms to calculate air pollution, BreezoMeter has quickly established itself as the world leader in hyper-local air quality data. The BreezoMeter API provides real-time information covering 5.5 billion people in 67 countries, accurate to within 300 meters.
What’s the highest air quality?
|Daily AQI Color||Levels of Concern||Values of Index|
|Orange||Unhealthy for Sensitive Groups||101 to 150|
|Red||Unhealthy||151 to 200|
|Purple||Very Unhealthy||201 to 300|
|Maroon||Hazardous||301 and higher|