Category: Smart Cities

Review: AirGradient Open Air

Sotirios PapathanasiouLeave a comment

Having had the opportunity to get the AirGradient Open Air (Model O-1PST) at the ASIC 2025 conference in Thailand, complete with its unique engraving, I’ve spent some time with this device, and it’s clear that AirGradient is pushing the boundaries of accessible and reliable outdoor air quality monitoring. This device presents a compelling alternative to existing solutions, particularly for those seeking transparency and robust performance.

Technical Specifications O-1PST

  • WiFi 2.4GHz IEEE 802.11 b/g/n-compliant
  • Bluetooth LE: Bluetooth 5, Bluetooth mesh
  • Status LED
  • Plantower PMS5003T for PM2.5 + ENS210 for T/RH
  • SenseAir S8/S88 CO2 NDIR Sensor
  • Sensirion SGP41 TVOC/NOX Module
  • Enclosure: ASA Plastic, UV Resistant and Weather Proof
  • Mounting Options: Wall or pole mounting options
  • 4m USB-C to USB-A Cable
  • USB-C Power Connector 2A/5V
  • Certifications: CE, RoHS, REACH, FCC

Sensor Selection: A Thoughtful Approach

The Open Air features a well-considered suite of sensors designed for accurate and insightful data. For PM2.5 measurements, it utilizes the Plantower PMS5003T, a sensor known for its reliability and found in other popular monitors like the PurpleAir (though it’s important to note the PMS5003T is a similar but not identical variant).

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From Boom to Bust: The Great IoT Air Quality Recession

Sotirios Papathanasiou2 Comments

The once booming Internet of Things (IoT) air quality monitoring market is facing a harsh reality check. Fueled by a surge in AI startups attracting investments and a subsequent saturation of low-cost air quality monitors, the industry is experiencing a period of upheaval. This downturn, dubbed “The Great IoT Air Quality Recession,” is forcing companies to adapt or face extinction. I see many high-profile executives leaving previously thought innovative startups in the realm of air quality in search of a more “stable” future.

A Wave of Investment and Sensor Saturation

AI startups like ChatGTP and similar, promising to leverage the power of machine learning to generate content or analyze data, became investor darlings. This new influx of cash is fueling the decline of IoT low-cost air quality solutions.

After the COVID-19 pandemic, the market quickly became saturated with low-cost monitors that promised that will fix indoor and outdoor environments. Buildings were filled with cheap monitors, but actionable insights remained scarce. The promised AI-powered analysis, in many cases, failed to materialize. Consumers were left with a plethora of data points with no clear understanding of what it all meant or what to do.

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5 European Cities Air Quality

Air Quality Report from 5 Major European Cities

Sotirios Papathanasiou2 Comments

European cities are showing significant progress in combating air pollution, according to data collected from active official traffic air quality stations. There are positive trends which translate to cleaner air for residents, with reductions in harmful pollutants like PM2.5 and NO2. This article explores the known strategies that these cities have implemented to achieve such remarkable improvements, offering valuable insights for other urban centers striving for a healthier future.

These are the 5 cities and traffic air quality stations that I have analyzed data from.

  • Berlin DEBE068 (B Mitte, Brückenstraße)
  • Madrid ES0118A (Escuela Aguirre)
  • Rome IT1906A (Arenula)
  • Paris FR04012 (Place Victor Basch)
  • Athens GR0003A (Aristotelous)
European Air Quality Network – Active and Inactive Air Quality Stations
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Outdoor Air Quality Monitors 2023Q4

Sotirios PapathanasiouLeave a comment

What’s new? Well, some clean up of discontinued monitors and some updates. In this list you will find ambient air quality monitors for experts who want to supervise and monitor air pollutants in cities and industrial sites, and commercial outdoor air quality monitors for homeowners who want to check the air quality outside their houses/apartments. 

Air pollution can cause a range of health problems, including respiratory and cardiovascular diseases (CVD), and even premature death. By monitoring ambient air quality, governments and individuals can take steps to reduce exposure to harmful pollutants and protect public health.

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Should Internal Combustion Engine Vehicles come with a permanent sticker on the back similar to the Tobacco packaging?

Sotirios PapathanasiouLeave a comment

I think we have come to a point in time where we are well aware of the dangers internal combustion engine (ICE) vehicles hide as they emit a tremendous amount of toxic pollutants that have a direct health impact on dwellers, especially in cities.

Nowadays, going to the center of a city by car is unnecessary and very impractical. However, many still insist on taking their huge SUVs even for a trip within a walking distance. Walking distance means going from one point to another no farther than 1,5 km / 1 mile or 15 minutes in time. I don’t think you will go any faster if you take your car because of all the hassle that it involves (parking, getting on board, load stuff, etc).

Schools here in Europe are within walking distances. This is the reason your kid cannot go to a school in a different district. Even then though, parents form huge queue outside of the schools in order to drop off their kids every single morning. No! It’s time to walk!

I believe cars should come with a permanent sticker on the rear side similar to the tobacco packaging in order to make people think and react. The sticker cannot be removed or covered by law. Maybe you will turn off the engine while waiting or not forcing the car to start even when new cars hibernate the engine automatically in traffic lights.

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Review: Senstate Urban Air Quality Station

Sotirios PapathanasiouLeave a comment

I was given the chance to review an air quality monitor from a European company that is located in one of the most contaminated countries with the highest concentrations of particulate matter − the notorious pollutant which causes premature deaths and many illnesses.

Each year during the cold winter months, Bulgaria has the highest PM2.5 concentrations of all EU-28 member states in urban areas (I have the chance to experience it in person in Sofia). The reason is wood and coal burning. Senstate Technologies SC is a Bulgarian company with experience in the field of environmental issues.

The Senstate Urban Air Quality Station is a versatile and configurable air quality monitor with cutting-edge technologies on board, I will give you more information about it in a hot minute.

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High-End Professional vs Low-Cost Professional Ambient Air Quality Monitors

Sotirios Papathanasiou4 Comments

In the space of ambient air quality monitoring, there are two basic and distinctive categories of professional air quality monitors; the High-End Professional and Low-Cost Professional monitors. I have been asked multiple times to recommend monitors for scientific studies and the deployment of them in cities.

It is very important to understand the strengths and weaknesses of both categories. It is also mandatory to recognize the fact that we will never get the exact same measurement from either category of sensors.

High-End Professional AQA

High-End Professional ambient air quality analyzers are used mostly by governments inside the air quality stations we have in most cities. Their strength is that they meet international standards for accuracy and they are certified by the EU (and similar bodies) to meet minimum performance requirements, in order to ensure that the measurement methods comply with the Data Quality Objectives set down in the Ambient Air Quality Directive (2008/50/EC) and in the amending Directive (EU) 2015/1480. Their weakness is that they require lots of energy to operate. In most cases, they are inside a fixed container with a refrigeration system to keep conditions stable. They are big and boxy in size and very expensive to purchase and operate. Additionally, they need constant maintenance by a technician. Another weakness is that in most cases these analyzers are not smart enough to broadcast measurement in real-time to the Cloud and they require other pieces of equipment to do that job, as a result, the cost of operation increases.

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Two Major Sources of Air Pollution in Cities that We Have to Address Today!

Sotirios PapathanasiouLeave a comment

Ambient air pollution is the world’s top driver of illness and death from chronic diseases like heart disease, stroke, cancer, diabetes and chronic lung disease.

According to WHO, ambient air pollution is the cause of almost 30% of all deaths and disease from lung cancer. Furthermore, polluted air is responsible for 24% of all deaths from stroke and 25% of all deaths and disease from ischaemic heart disease. Finally, it attributes to 43% of all deaths and disease from chronic obstructive pulmonary disease (COPD). Noncommunicable diseases (NCDs) are linked to low-income communities.

Which are the top 2 sources of Air Pollution in cities in 2022?

Wood and biomass burning

Yes, that’s right the “cozy” wood stoves that most people love and brag about are the number one sources of air pollution in cities all around the world. The population on earth takes turns each year, during the 6 cold months in the northern hemisphere and the other 6 months in the southern hemisphere. All wood-burning stoves are very dirty, it doesn’t matter if they are old fireplaces, EPA certified, or pellet stoves. They all emit a tremendous amount of particulate matter which is responsible for all the illnesses and deaths I have mentioned above.

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Review: Kunak Air PRO – Ambient Air Quality Monitor

Sotirios PapathanasiouLeave a comment

Time to talk seriously about ambient air pollution and how technology can help us see and consequently mitigate it. According to a 2016 report, the annual cost of air pollution has to the global health care system has risen to US$ 176 billion from US$ 21 billion in 2015 and the number of workdays lost to air pollution-related illness bounces to 3.7 billion from 1.2 billion. According to another report, ambient air pollution kills more than 3 million people across the globe every year but more importantly causes health problems that increase the annual health care budget.

Unfortunately, air pollution is not taken very seriously by governments and society because we tend to dismiss things we can’t see or understand. Here comes Kunak which is one of the leading companies in the field of monitoring air pollution accurately. Recently, the monitor Kunak Air PRO has been rewarded at the AirLab Challenge 2021 as the most accurate multi-pollutant ambient monitor and it is made in Spain.

Experts, academics, the city, and policymakers all need air quality monitors in order to quantify the ambient air, get the right conclusions about the situation, and finally, make the right decision on how to mitigate the pollution and the health care costs. As you can understand the accuracy of the monitor is very crucial and Kunak delivers great results.

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Outdoor Air Quality Monitors 2021Q4

Sotirios Papathanasiou9 Comments

What’s new? Well, lots of new Outdoor Air Quality Monitors have been released into the market for various purposes and different budgets. Air quality monitors for professional use in cities and industrial sites and homeowners who want to supervise the ambient air quality outside their houses/apartments.

This time, I have included the General Star Score from the AIRLAB Challenge 2021 for the monitors that took part. The Ethera NEMo Outdoor monitor scored the highest with 4.5 Stars out of 5.

uRADMonitor with the Smoggie and City models scored 4/5 and 3.5/5, respectably. Also the Kunak Air Pro which I will review soon scored 4/5. It is great to see that all these solutions deliver accurate results.

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