Open Access

Table 1

Nigerian air quality standards.

Pollutants Time of average Limit Health effect when exposed beyond limit
Particulates Daily average of daily values for 1 hour. 250 μg/m3
600 μg/m3
Breathing/respiratory problems
Sulphur oxides (Sulphur dioxide) Daily average of hourly values 1 hour 0.01 ppm (26 μg/m3)
0.1 ppm (26 μg/m3
Skin and lung disease
Carbon monoxide Daily average of hourly values 8-hourly average 10 ppm (11.4 μg/m3)
20 ppm (22.8 μg/m3)
Headache, dizziness, weakness, nausea, vomiting
Nitrogen oxides (Nitrogen dioxide) Daily average of hourly values (range) 0.04 ppm–0.06 ppm
(75.0 μg/m3-113 μg/m3)
Coughing, wheezing, eye irritation, nose and throat irritation

Source: Nigerian Federal Environmental Protection Agency, (1991) [10] and Berglund et al, (1992) [39].

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.