A lightweight yet high-performing air quality monitor that measures particulate matter plus up to two gases of interest, the AQS 1 is designed for short and long-term monitoring studies and is affordable enough to be deployed in small networks for a range of applications:

  • Construction dust and emissions
  • Roadside traffic emissions
  • Rail corridor and terminal emissions
  • Mapping ozone formation and distribution
  • Air quality model validation
  • Community exposure studies
AQS1 mini air quality station


AQS 1 construction air monitor (CAM)

Construction Air Quality Monitor

Configured for the main pollutants present at construction and demolition sites, the AQS 1 measures multiple particle fractions (TSP, PM10 and PM2.5) and nitrogen dioxide (NO2).

AQS 1 Urban Air Quality Monitor

Urban Air Quality Monitor

Lightweight for easy installation and relocation, the AQS 1 measures the key pollutants of concern in the urban environment: nitrogen dioxide (NO2), ozone (O3) and particulate matter (PM).

AQS remediation air monitor (RAM)

Remediation Air Quality Monitor

For air quality compliance at remediation and landfill sites, the AQS 1 measures particulate matter (TSP, PM10 & PM2.5), volatile organic compounds (VOCs), and optional nitrogen dioxide (NO2).

AQS 1 Smog Monitor

Smog Monitor

With a very high correlation to U.S. EPA reference analyzers, the AQS 1 measures the key indicator pollutants of photochemical smog, PM2.5 and ozone (O3), continuously and in real-time.


The AQS 1 system is modular. Each sensor is housed in a module, and the system is built with only the modules you require. The AQS 1 can measure particulate matter (PM) and up to two gases at the same time. Each module is connected with the control system for air sampling, data and power. All module data is available on the same software interface.

At any time, the AQS 1 can be upgraded to measure additional parameters by adding new modules in the field. You can choose from the following parameters:

  • Particulate matter: TSP, PM10, PM2.5, PM1
  • Gases: O3, NO2, VOCs
  • Meteorological: temperature, humidity, rain, pressure, wind speed / direction, solar radiation
  • Noise
What does the AQS 1 measure?


The AQS 1 combines a robust light-scattering nephelometer, and Aeroqual’s industry leading gas analyser from the AQM 65 platform. Key technology unique to Aeroqual sets the AQS 1 apart in the industry, including:

Pumped sampling system. This provides a steady flow of air to the sensor modules. It also allows for the use of filters which protect the sensors from airborne impurities – therefore extending their operating life.

Automatic Baseline Correction (ABC). Pioneered in the AQM by Aeroqual, this technique sees the automatic correction of the ‘zero’ baseline every 60 seconds. The technique corrects for cross interferences and sensor drift – two of the biggest problems for sensor-based monitors.

Interference-free NO2 measurement. Most sensor-based monitors use an electrochemical sensor to measure NO2. The problem is that NO2 electrochemical sensors respond equally to ozone (O3), so the sensor output is actually NO2+O3. Professionals want to know exactly how much O3 and NO2 is present and when. We achieve this by using the highly selective Aeroqual ozone sensor to correct for ozone interference on the electrochemical NO2. The technique is patented by Aeroqual.

Tried and tested PM sensing. A nephelometer made by Met One Instruments and custom-designed for Aeroqual is integrated into the AQS 1. Compared to low cost optical counters, the Met One nephelometer is robust and proven to last for years in the field. In the AQS 1 the nephelometer is coupled with a pumped sampling system and an inlet heater which corrects for humidity interference.

Factory and Field Calibration. The AQS 1 sensor modules are calibrated against high purity gas standards prepared under ISO 6143 to ensure traceability to reference materials from National Metrology Institutes. The AQS 1 is field calibrated using the same standard reference materials as a US EPA / EU certified analyser (i.e. calibration gas and dilution calibrators).

Software. Connect to your instrument remotely via WIFI, Ethernet or cellular. Accessed through a custom-built software interface, the software gives you and other trusted users secure access to your quality data in real-time. It also enables engineers to provide remote technical support and servicing. The software is browser based, so simply connect your computer or device and away you go.

Inlet filters ensure hygiene and integrity of gas sample
Inlet filters ensure hygiene and integrity of gas sample
Traceable factory and field calibration
Traceable factory and field calibration


Key technology features of the AQS 1 enable it to deliver data with very strong correlation to U.S. EPA approved monitors (Near Reference) over extended periods of time – several years with appropriate maintenance.

In head-to-head tests with traditional U.S. EPA-approved analyzers, the AQS 1 has shown R2 correlations as high as 0.98.

Extensive field tests have been run in the USA, China and New Zealand. Ozone and PM results are covered in the reports from the China and USA tests. Data capture rates for China were above 96% and 100% for USA. The results show excellent correlation with independently run U.S. EPA-approved reference methods. We are still gathering long term NO2 datasets. Initial data is available on request. A snapshot of the NO2 data below shows very strong correlation with a US-EPA approved chemiluminescent NOx analyser. Over a 20-day period the AQS 1 NO2 demonstrated R2 correlation of 0.95.

AQS 1 vs Reference NO₂ (1-hour average)


Our customers using the AQS 1 Mini Air Quality Station

By choosing Aeroqual you’ll be joining a community from across the world.

  • US Embassy Belgium
  • English Schools Foundation China

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