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Urban Water Supply
Urban Air Quality
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Frequently Asked Questions
What main pollutants should be monitored in an urban outdoor environment?
Six main pollutants contribute most to the quality of the air and the well-being of citizens. These are Particulate Matter 10 and 2.5 (PM10 and PM2.5), Nitrogen Dioxide (NO2), Ground-level ozone (O3), Carbon Monoxide (CO), and Sulfur Dioxide (SO2).
Why these six pollutants are most important?
These six pollutants are most commonly found in urban environments and have the highest impact on citizens’ health and well-being. Namely:
- PM10 and PM2.5 come from car exhaust particles, tire wear, brake dust, road dust generated by vehicle traffic, domestic fuel, and industrial emissions.
- NO2 is a by-product of fuel combustion at high temperatures. Cars and power plants are the main sources. The brown haze sometimes seen over cities is mainly nitrogen oxides.
- O3 is formed by the reaction of nitrogen oxides, hydrocarbons, and sunlight. Major sources of ozone are the chemical processes caused by industry and traffic.
- SO2 comes from burning coal and heavy fuel oil by industry and small-scale heating systems (that use poor quality sulfurous oil or coal).
- CO is a product of incomplete combustion of fuel and propellants. Major sources are traffic and industry.
Why choose Develiot’s Urban Air Quality Monitoring Station?
Look at three main things:
- Station quality. Monitoring air quality outdoors is hard. Air quality stations must operate accurately outdoors in all four seasons, for long periods of time and provide accurate data regardless of the external environment (temperature, humidity, etc.). Ask the vendor how it is ensuring all of these.
- Gas sensors quality. Keep in mind that sensor resolution is more important than sensor range. You need to detect accurately small changes (ug/m3 in most cases) in a limited range, not the other way around. Thus, for example, a NO2 sensor with detection range 0-1 ppm and resolution of 0.01 ppm is better than a NO2 sensor with detection range of 0-50 ppm and resolution of 0.5 ppm.
- Maintainability. Maintenance is cost. Make sure that the station is easy to install, maintain, support, and replace consumables. For example, make sure that sensors can be replaced easily on-site.
What is the Air Quality Index (AQI)?
The Air Quality Index (AQI) is a color code used to easily communicate the air quality level. It usually goes from green (very good) to red (very poor). It considers the levels of the six main air quality parameters: Particulate Matter 10 and 2.5 (PM10 and PM2.5), Nitrogen Dioxide (NO2), Ground-level ozone (O3), Carbon Monoxide (CO) and Sulfur Dioxide (SO2).
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