Azura-Edo Independent Power Plant Environmental Impact ... - IFC

Process Emissions: NO x and CO
The negative impacts identified due to air borne emissions at the Azura Edo
IPP site are impacts on human health from emissions of NO x and CO arising
from the combustion of fuel in the power plant.
The impacts of emissions arising from the operation of the power plant have
been quantified. A summary of the results are set out in Table 7.11. The table
details the maximum impact at any location. In order to assess potential
impacts, comparison has been made with EU and Nigerian FEMA air quality
standards.
Table 7.11
Summary of Impacts due to Process Emissions (Azura Edo IPP)
Pollutant
Averaging
Period
Source
Criterion
(µg/m 3 )
Maximum
Impact
(µg/m 3 )
Percent of
Criterion
(%)
Significance
NO 2
CO
Annual mean EU/WHO 40 0.33 0.8% Insignificant
1 hour mean EU/WHO 200 60.2 30.1% Minor
adverse
impact
1 hour mean Nigerian 75-113 60.2 80.3%-
53.3%
Minor
adverse
impact
8 hour rolling EU 10000 121.2 1.2% Insignificant
average not to
be exceeded
more than 3
times per year
8 hour mean WHO 40000 121.2 0.3% Insignificant
1 hour mean WHO 30000 164.3 0.5% Insignificant
1 hour mean Nigerian 11400 164.3 1.4% Insignificant
As the table indicates, the annual mean NO 2 concentration and all the
averaging periods for CO are less than 25 percent of the criterion (EU, WHO
and Nigerian emission limits), resulting in insignificant impacts for CO.
Although the 1 hr ambient NO 2 concentration remains considerably below any
standards used, this is however greater than 25 percent of the EU/ WHO and
Nigerian air quality standards.
Overall, the assessment indicates that the emissions from the Project will
result in a minor adverse impact on air quality as a result of emissions of NO 2
and an insignificant impact as a result of emissions of CO.
The results of the assessment are presented graphically in Figure 7.4 and
Figure 7.5 showing nearby sensitive receptors and the following:
• Annual mean NO 2, Azura Edo IPPonly; and
• 1 hour maximum NO 2, Azura Edo IPP only.
AZURA EDO IPP
7-25
DRAFT EIA REPORT