Air Quality
Air pollution is one of the most important
factors affecting the quality of life and the health of the
increasingly urban population of industrial societies. All major
cities have networks of monitoring stations providing continuous
measurements of the most important pollutants. However, the number
of these stations is usually very small.
Air pollution is highly location dependent, for
example, the vicinity of traffic chokepoints or certain industrial
installations has much worse air quality than average.
A detailed picture based on real-time data from
mobile sensors for the entire populated area offers major benefits
to air quality control.
Air quality SmartSpace sensor is a pervasive
sensor device capable of measuring air quality and relaying data via
wireless communications to a central server.
Easily deployed by fixing to lamp posts or
similar street furniture at a height of 2.5m plus and up to 80-100 m
apart. The units are small, low cost and completely wireless,
designed for all weather conditions with a continual power supply
provided by internal battery, making them rapid and easy to deploy
in large numbers (up to thousands of sensors in a city area) to
provide real time pollutant information.
Barometric pressure, humidity and temperature combined in one
stable environmental sensor.
GASES
SmartSpace sensors allow to monitor the concentration of following gas to determine the
air quality:
-
Carbon dioxide (CO2):
it is a gas
naturally present in our atmosphere. Together with water
vapor and other gases is one of the greenhouse gases
that regulate Earth's temperature. Production in excess
as a result of increased fossil fuel usage could have a
direct impact on climate change.
-
Carbon monoxide (CO): it is produced in
incomplete combustion, ie, when part of the fuel does
not react completely due to a lack of oxygen. Its danger
to humans and animals, once it sets in blood hemoglobin,
it prevents oxygen transport, which can be lethal.
Although in open space is easily diluted, the CO
emission from the engines of cars in congested areas
causes may have rates of 50-100ppm, which are dangerous.
-
Nitrogen dioxide (NO2): it is a
gas produced by the rapid oxidation of NO, which is
produced by burning fossil fuels in vehicles and
industry. It is a toxic and irritating gas that affects
the respiratory system and also encourages the
production of nitric acid (HNO3) responsible for acid
rain.
-
Methane (CH4): it is produced
when organic materia decomposes in oxygen-poor
environments. As carbon dioxide, it is a greenhouse gas
so its increase may contribute to global warming.
-
Hydrogen sulfide (H2S): it is emitted
into the atmosphere by various industries, such as
paper. It is particularly dangerous because it is a
highly toxic gas and it is a sulfur dioxide precursor,
one of the gases in the processes of formation of acid
rain.In addition, this gas is specially annoying
because of its foul smell.
-
Hydorcarbons (Ethanol, Propane, Butane,
Isobutane, Toluene): they come from various
sources, such as poor combustion of gasoline and diesel
or indsutrial processes. They are, among others,
responsible for greenhouse effect and contribute to
produce respiratory problems.
- Ozone (O3):
it is a natural constituent that can be found at
sea level with a concentration of 0.01 mg / kg. However,
with intense solar radiation and high contamination
coming from vehicles, its concentration can go up to 0.1
mg / kg being dangerous. In this proportion, the plants
may be affected and human may experience irritation of
nasal passages and throat and dryness in the lining of
the respiratory tracts.
Many other gas concentration sensors are available, to
monitor specific industrial processes.
- Chlorine dioxide (CLO2)
- Chlorine (CL2)
- Ethylene oxide (ETO)
- Hydrogen (H2)
- Phosphine (PH3)
- Sulfur dioxide (SO2)
- Nitric oxide (NO)
- Oxygen (O2)
- Hydrogen Cyanide
(HCN)
- Ammonia (NH3)
- Hydrogen Chloride
(HCL)
- Volatile Organic
Compound (VOC)
- Liquefied Petroleum Gas
(LPG)
PARTICULATES
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- PM10: Air
pollution can take the form of solid particulate. Some
particulates occurr naturally from volcanoes, dust storms,
forest and grassland fires, living vegatation. Other from
human activities, such as the burning of fossil fuels in
vehicles. Increased levels of the fine particles in the air
are linked to health hazards such as heart disease, altered
lung function and lung cancer. The sensor is capable of
measuring concentrations down to 0,1 micrograms per cubic
meter of PM10 (Particles on the order of 10 micrometers or
less). This size of particulate matter has been agreed upon
for monitoring by most regulatory agencies.
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