• Campbell Associates

Air Quality Measurement Case Study

AEROQUAL AQY1

Air Quality Measurement that’s smart and accurate


Overview

  • Simultaneous NO2, O3, PM2.5, PM10, T and RH

  • Delivers real-time, minute by minute data ensuring that trends throughout the day, week and month are not missed out

  • Low cost to purchase and service

  • Low maintenance (sensors to be replaced every 18 to 24 months)

Technical advantages

· Active fan-sampling (better than simple diffusion)

· Aeroqual’s best in class GSS ozone sensor

· Interference-free NO2 measurement


· Measure Ox (O3 + NO2) by electrochemical sensor

· O3 by Aeroqual GSS

· NO2 by difference [NO2] = [Ox] – a[O3]

· Automatic Baseline Correction (continuous zero) on ozone sensor

· Auto correction of humidity effects on PM10 and PM2.5 measurements

· Anti-static inlet to avoid loss of particulates during sampling

· Ability to be calibrated remotely


Data correction and optimisation is done through the monitor, not in the cloud, ensuring the integrity of the data and helping to maintain confidence in the measurement.

Data

· Communicates wirelessly via WIFI or 3/3.5/4G cellular

· On board storage to protect against data loss

· Open API for access to data

· Remote technical support and instrument health monitoring

· Web-based air quality monitoring software available

Data Sheet and Evaluation

  • Data Sheet – available here

  • South Coast AQMD AQ-SPEC Field Evaluation – available here

  • EPA Evaluation of Emerging Air Pollution Sensor Performance – available here

Calibration

· Co-location with Reference: A good option especially if deployment sites are similar to the co-location site. Can be done before and after a project. Check here for the calibration results from a selection of 20 AQYs.

· MOMA calibration: Developed by Aeroqual and University of Auckland to improve the calibration of sensors in dense networks. Identifies proxy reference stations and matches the sensor distribution to the distribution of the proxy reference.


Installation

· Can be installed in tight spaces

· Elexon code rating to make it easier to deploy on lampposts

· Mains powered to avoid reliance on sun/replacing batteries

· Security cage available to protect the AQY against vandalism

· Optional street light adaptor box

o Makes the installation hassle free and allows you to easily move the AQY to another site

o Provides power for not only the AQY but other sensors, like camera and acoustic sensors that can add more value to your network



Case studies and co-location studies

· Co-location at the Urban Observatory in Newcastle Upon-Thyme showed how good the sensors correlate to reference analysers. Sensors proved to be stable over time and selective to the main urban pollutants. Please find the document here. The case study is available here.

· Air Quality Monitoring at Schools - Does the annual mean give the FULL picture of the real exposure to air pollution? This case study seeks to identify if air pollution levels within the grounds of a selected UK Primary School are possibly exceeding national air quality objectives, potentially exposing the children there to high levels of air pollutants. The school itself is located near a busy junction where traffic from vehicles entering and leaving a nearby housing estate combine with parents dropping off and picking up their children at the school. Such high levels of vehicular traffic could potentially be negatively impacting the air quality within that area. For this reason, a local authority deployed one Aeroqual AQY - Micro Air Quality stations on the school’s façade from the end of 2019 to the beginning of 2020. The resulting study shows the pollution levels that pupils were exposed to during this time and brings up the question of whether or not using the annual mean to provide a comprehensive picture of actual exposure to air pollution is an effective method for carrying out community exposure studies. The evidence could suggest that a significant proportion of children who attend schools in urban areas are being exposed to levels of air pollution that studies show to be dangerous. Access the case study here.

· Air Quality Monitoring at Bus Stops. Case study showing how monitoring air pollution with the Aeroqual AQY can show daily trends that assist the implementation of mitigation measures and improve air quality in areas such as tunnels and bus stops. Click here to read the full case study.

Aeroqual AQY Networks around the globe

· 100 units deployed in Los Angeles in 2017 and other 60 units to be deployed by 2020 - click here for the case study

· San Francisco

· New York

· Suffolk

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