Please find below the latest emissions to air
data for the SELCHP Energy Recovery Facility which we are required to monitor
on a continuous basis.
This information will be updated regularly
Years : 2008, 2007, 2006
Charts : June 2008, May 2008, April 08, March 08, February 2008, January 08, December
| Daily Average Emissions Limit | ||
| • | Dust (Particulates) | 10mg/m3 |
| • | Total Organic Carbon | 10mg/m3 |
| • | Hydrogen Chloride | 10mg/m3 |
| • | Carbon Monoxide | 50mg/m3 |
| • | Sulphur Dioxide | 50mg/m3 |
| • | Oxides of Nitrogen | 200mg/m3 |
Please see below for further information on the
emissions monitored.
Dust (Particulates)
What type of substance is it?
Particulates is the term used to describe tiny particles in the air, made
up of a complex mixture of soot, organic and inorganic materials having a
particle size less than or equal to 10 microns diameter (10 microns is equal
to one hundredth part of a millimetre). Particulates is one of the eight substances
for which the government has established an air quality standard as part of
its national Air Quality Strategy.
How is it released?
There are many man-made sources of Particulates, including road transport
and industry. There are also natural sources, for example, volcanoes and dust
storms.
Total Organic Carbon (TOC)
What type of substance is it?
Total Organic Carbon is part of a large group of liquids and gases often called
volatile organic compounds (VOCs). The liquids easily vaporise at room temperature
and many are colourless and odourless. They are of general concern because
of their ability to react with other pollutants, such as nitrogen oxides,
in the lower atmosphere to form ozone. High concentrations of ozone at ground
level can harm human health, damage crops and affect materials such as rubber.
Some VOCs may be directly harmful to human health, contribute to global warming
or destroy stratospheric ozone needed to shield the earth's surface from harmful
ultra violate radiation.
How is it released?
Paints, natural gas, petrol, road transport and industrial processes are the
major sources of these compounds, however some are also produced by natural
biological processes.
Hydrogen Chloride
What type of substance is it?
Hydrogen chloride is both a naturally occuring chemical and is manufactured
by man. It is a colourless, chemically reactive gas with a strong, pungent
odour. In solution with water it forms a strong acid - hydrochloric acid.
The gas is acidic and corrosive.
How is it released?
The main source of hydrogen chloride releases are coal burning power stations.
Smaller quantities are also emitted from waste incinerators.
Carbon Monoxide
What type of substance is it?
Carbon monoxide is both a common naturally occuring chemical and is manufactured
by man. It is a colourless, odourless poisonous gas. Carbon monoxide is one
of the eight substances for which the government has established an air quality
standard as part of its national Air Quality Strategy.
How is it released?
The main man-made source of carbon monoxide is petrol vehicles which are not
fitted with a catalytic converter. Small amounts are also released from the
burning of fossil fuels in power stations and waste incinerators. Faulty domestic
gas boilers and domestic cookers are also sources and the gas is also found
in tobacco smoke. Smaller amounts are also produced by natural processes
Sulphur Dioxide
What type of substance is it?
Sulphur dioxide is man-made and naturally occurring colourless gas with a
penetrating odour. It dissolves in water to form an acidic solution of sulphurous
acid. Sulphur dioxide gas is one of the main chemicals that causes acid rain.
Concentrations sometimes found in the polluted environment can damage crops
and forests and acidify sensitive soils and water bodies. Sulphur dioxide
is one of the eight substances for which the government has established an
air quality standard as part of its national Air Quality Strategy.
How is it released?
Sulphur dioxide is produced by burning coal and oil. Power stations and oil
refineries release most of the sulphur dioxide in the air, but releases from
domestic open fires can also affect local concentrations. Releases from its
industrial uses are relatively small. Sulphur dioxide is also found naturally
in the air at low concentrations from natural releases such as volcanoes and
forest fires.
Nitrogen Oxides
What type of substance is it?
The term 'nitrogen oxides' (NOx) is usually used to includes two gases - nitric
oxide (NO), which is a colourless, odourless gas and nitrogen dioxide (NO2),
which is a reddish-brown gas with a pungent odour. Nitrogen oxides contribute
to acid rain, depletion of the ozone layer and have detrimental effects on
health. They are also greenhouse gases. Nitrogen dioxide is one of the eight
substances for which the government has established an air quality standard
as part of its national Air Quality Strategy.
How is it released?
Major man-made releases of nitrogen oxides are primarily from fuel combustion
(including vehicles), biomass burning and some production processes. There
are also minor natural sources such as lightning, natural fires and biological
processes in soils and waters.
For further information about these emissions please visit the
Environment
Agency Website.
