Clarity makes it easier and more cost effective to measure air quality when and where you need it. Our comprehensive sensing-as-a-service subscription for each measurement point includes:
Calibration requires each device to be co-located with government reference equipment for several weeks before deployment in the field. Field data are manually calibrated and devices are repeatedly co-located for calibration profiles updates, resulting in a resource intensive process with high operational costs and limited ease of use.
Smart Calibration lowers the cost, labor, and time requirements for calibration, significantly simplifying the deployment process. A single Clarity device is co-located with government reference equipment for the project duration while the remaining devices are concurrently deployed in the field for real-time insights.
We have engaged in projects in 60 Cities across 30+ Countries with more than 20 government co-locations that help us validate our technology. To learn more, read about past and current projects on our blog.
We work with air quality regulatory and research agencies to validate our technology. Read our third party evaluation reports below.
How can I access data? What’s the difference between Clarity’s SmartCity web app and OpenMap?
SmartCity Web App (smartcity.clarity.io) is Clarity’s data visualization and download tool. Users log in with their unique account credentials to view, plot, and download current and historical raw and calibrated data.
We launched Clarity OpenMap (openmap.clarity.io), our public repository of select Clarity devices around the world, in response to the need for localized, real-time air quality data during the Northern California wildfires in October 2017. Since then, we’ve integrated OpenMap into our product line as our open data platform for community devices (Node-C) and government/industry customers who opt in to making their data public.
How is AQI calculated?
The AQI aggregates different pollutants to a single reference number from 0 to 500 for air quality reporting. A higher number indicates more polluted air. The location marker for each Clarity device will indicate the color of the current AQI. Clarity’s AQI settings allow you to customize AQI calculations based on PM2.5 mass concentration and/or NO2 concentration measurements. By default, Clarity’s AQI is calculated by PM2.5 mass concentration only. Please refer to the US EPA’s Air Quality Index (AQI) Basics for more detailed instructions on how to interpret AQI.
What is Smart Calibration?
Smart Calibration is Clarity’s “white-boxed” quality assurance and control process that allows us to eliminate the high operational and deployment costs of a traditional sensor calibration process with remotely calibrated data streams in real-time. In the past, all devices would need to be co-located with the reference prior to deployment in the field. Additionally, all these devices would need to be recalibrated against the reference monitor periodically.
Clarity’s Smart Calibration simplified this process. Due to the low device-to-device variation of Clarity’s factory-calibrated devices, only a single device is required to be co-located with reference equipment for the duration of the project while the remaining sensors are concurrently deployed in the field. Both raw and calibrated data (when available) are provided to our customers.
For more information on Smart Calibration and how it works, please contact us at firstname.lastname@example.org.
How do the timestamps Clarity use work?
API and downloaded .CSV data always use UTC timestamps to reflect the industry standard. On the other hand, timestamps displayed on the SmartCity web app, including time selection on the Data Download tool, adjust to local time according to your computer’s clock. Please be conscious of this difference and convert timestamps accordingly.
You may also notice varying timestamp intervals when pulling data on the highest time resolution. As the device sleeps in between sampling and uploading times to conserve power, the timestamps for when data are actually received each uploading period vary as the device reconnects to the network after sleep mode. On average, timestamp intervals fall between 2-3 minutes for externally powered devices and 15-18 minutes for solar powered devices. Please view data at a lower time resolution for fixed intervals.
When viewing hourly data, the data points in the previous hour are averaged into the next hourly datapoint. For example, datapoints at 3:15pm, 3:30pm, and 3:45pm are averaged to calculate the 4pm hourly datapoint.
What is the sampling frequency? Can I customize my sampling frequency?
Solar powered Node-S devices have a default sampling frequency of every 15 minutes. Externally powered Node devices have a default sampling frequency of every 5 minutes. Each data point is time-integrated for 1 minute after the device turns on at the preset frequency and then uploaded to the Cloud. We can adjust sampling frequency as requested if a device has external power or sufficient solar power to support the requested sampling rate.
Why are my readings negative/erratic/different from other nearby measurements?
Only raw readings will be available upon initial deployment, which means you may experience negative or erratic values until the sensor stabilizes and enough co-location data are available to apply calibration. Specific behaviors also depend on the environmental parameter:
- PM2.5 readings may over-report values until correlation coefficients are established from regulatory equipment. This typically requires 1 month of co-location data and then calibrated data will be made available in parallel with the raw data.
- NO2 readings may run negative until baseline conditions for the device's unique deployment location are characterized. This typically requires 1 month and then calibrated data will be made available in parallel with the raw data.
For additional questions not answered here, please email email@example.com.