Characterization of Ambient Air Quality in Selected Urban Areas in Uganda Using Low-Cost Sensing and Measurement Technologies
Air pollution is prevalent in cities and urban centers in developing countries including sub-Saharan Africa, but ground monitoring data on local pollution remain inadequate, hindering effective mitigation. We employed low-cost sensing and measurement technologies to quantify pollution levels based o...
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Veröffentlicht in: | Environmental science & technology 2022-03, Vol.56 (6), p.3324-3339 |
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creator | Okure, Deo Ssematimba, Joel Sserunjogi, Richard Gracia, Nancy Lozano Soppelsa, Maria Edisa Bainomugisha, Engineer |
description | Air pollution is prevalent in cities and urban centers in developing countries including sub-Saharan Africa, but ground monitoring data on local pollution remain inadequate, hindering effective mitigation. We employed low-cost sensing and measurement technologies to quantify pollution levels based on particulate matter (PM2.5), NO2, and O3 over a 6 month period for selected urban centers in three of the four macroregions in Uganda. PM2.5 diurnal profiles exhibited consistent patterns across all monitoring locations with higher pollution levels manifesting from 18:00 to 00:00 and from 06:00 to 09:00; while the periods from 00:00 to 05:00 and from 09:00 to 17:00 had the lowest levels. Daily PM2.5 varied widely between 34 and 107 μg/m3 over a 7 day period, well within unhealthy levels (55.5–150.4 μg/m3) for short-term exposure. The inconsistent daily trend are instructive for multiple pollutant assessment to aid specific policy initiatives. The results also show inverse relations between seasonal particulate levels and precipitation, that is, R (correlation coefficient) = −0.93 and −0.62 for Kampala and Wakiso, R = −0.49 and −0.44 for the Eastern region, and R = −0.65 and −0.96 for the Western region. NO2 monthly concentrations replicated PM2.5 spatial levels, whereas O3 exhibited inverse relations probably due to a higher retention time in less-urbanized environments. Both PM2.5 and NO2 correlated positively with the resident population. Our findings show significant spatiotemporal variations and exceedances of health guidelines by about 4–6 times across most study locations (with two exceptions) for longer-term exposure. This paper demonstrably highlights the practicability and potential of low-cost approaches for air quality monitoring, with strong prospects for citizen science. This paper also provides novel information regarding air pollution that is needed to improve control strategies for reducing exposures. |
doi_str_mv | 10.1021/acs.est.1c01443 |
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We employed low-cost sensing and measurement technologies to quantify pollution levels based on particulate matter (PM2.5), NO2, and O3 over a 6 month period for selected urban centers in three of the four macroregions in Uganda. PM2.5 diurnal profiles exhibited consistent patterns across all monitoring locations with higher pollution levels manifesting from 18:00 to 00:00 and from 06:00 to 09:00; while the periods from 00:00 to 05:00 and from 09:00 to 17:00 had the lowest levels. Daily PM2.5 varied widely between 34 and 107 μg/m3 over a 7 day period, well within unhealthy levels (55.5–150.4 μg/m3) for short-term exposure. The inconsistent daily trend are instructive for multiple pollutant assessment to aid specific policy initiatives. The results also show inverse relations between seasonal particulate levels and precipitation, that is, R (correlation coefficient) = −0.93 and −0.62 for Kampala and Wakiso, R = −0.49 and −0.44 for the Eastern region, and R = −0.65 and −0.96 for the Western region. NO2 monthly concentrations replicated PM2.5 spatial levels, whereas O3 exhibited inverse relations probably due to a higher retention time in less-urbanized environments. Both PM2.5 and NO2 correlated positively with the resident population. Our findings show significant spatiotemporal variations and exceedances of health guidelines by about 4–6 times across most study locations (with two exceptions) for longer-term exposure. This paper demonstrably highlights the practicability and potential of low-cost approaches for air quality monitoring, with strong prospects for citizen science. This paper also provides novel information regarding air pollution that is needed to improve control strategies for reducing exposures.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/acs.est.1c01443</identifier><identifier>PMID: 35147038</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>Air monitoring ; Air Pollutants - analysis ; Air pollution ; Air Pollution - analysis ; Air pollution measurements ; Air quality ; Airborne particulates ; Anthropogenic Impacts on the Atmosphere ; Correlation coefficient ; Correlation coefficients ; Developing countries ; Environmental monitoring ; Environmental Monitoring - methods ; Exposure ; LDCs ; Low cost ; Mitigation ; Nitrogen Dioxide ; Outdoor air quality ; Particulate matter ; Particulate Matter - analysis ; Pollutants ; Pollution levels ; Pollution monitoring ; Retention time ; Uganda ; Urban areas ; Urban environments</subject><ispartof>Environmental science & technology, 2022-03, Vol.56 (6), p.3324-3339</ispartof><rights>2022 The World Bank. 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The results also show inverse relations between seasonal particulate levels and precipitation, that is, R (correlation coefficient) = −0.93 and −0.62 for Kampala and Wakiso, R = −0.49 and −0.44 for the Eastern region, and R = −0.65 and −0.96 for the Western region. NO2 monthly concentrations replicated PM2.5 spatial levels, whereas O3 exhibited inverse relations probably due to a higher retention time in less-urbanized environments. Both PM2.5 and NO2 correlated positively with the resident population. Our findings show significant spatiotemporal variations and exceedances of health guidelines by about 4–6 times across most study locations (with two exceptions) for longer-term exposure. This paper demonstrably highlights the practicability and potential of low-cost approaches for air quality monitoring, with strong prospects for citizen science. 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Sci. Technol</addtitle><date>2022-03-15</date><risdate>2022</risdate><volume>56</volume><issue>6</issue><spage>3324</spage><epage>3339</epage><pages>3324-3339</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><abstract>Air pollution is prevalent in cities and urban centers in developing countries including sub-Saharan Africa, but ground monitoring data on local pollution remain inadequate, hindering effective mitigation. We employed low-cost sensing and measurement technologies to quantify pollution levels based on particulate matter (PM2.5), NO2, and O3 over a 6 month period for selected urban centers in three of the four macroregions in Uganda. PM2.5 diurnal profiles exhibited consistent patterns across all monitoring locations with higher pollution levels manifesting from 18:00 to 00:00 and from 06:00 to 09:00; while the periods from 00:00 to 05:00 and from 09:00 to 17:00 had the lowest levels. Daily PM2.5 varied widely between 34 and 107 μg/m3 over a 7 day period, well within unhealthy levels (55.5–150.4 μg/m3) for short-term exposure. The inconsistent daily trend are instructive for multiple pollutant assessment to aid specific policy initiatives. The results also show inverse relations between seasonal particulate levels and precipitation, that is, R (correlation coefficient) = −0.93 and −0.62 for Kampala and Wakiso, R = −0.49 and −0.44 for the Eastern region, and R = −0.65 and −0.96 for the Western region. NO2 monthly concentrations replicated PM2.5 spatial levels, whereas O3 exhibited inverse relations probably due to a higher retention time in less-urbanized environments. Both PM2.5 and NO2 correlated positively with the resident population. Our findings show significant spatiotemporal variations and exceedances of health guidelines by about 4–6 times across most study locations (with two exceptions) for longer-term exposure. This paper demonstrably highlights the practicability and potential of low-cost approaches for air quality monitoring, with strong prospects for citizen science. This paper also provides novel information regarding air pollution that is needed to improve control strategies for reducing exposures.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>35147038</pmid><doi>10.1021/acs.est.1c01443</doi><tpages>16</tpages><orcidid>https://orcid.org/0000-0002-6592-7187</orcidid></addata></record> |
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subjects | Air monitoring Air Pollutants - analysis Air pollution Air Pollution - analysis Air pollution measurements Air quality Airborne particulates Anthropogenic Impacts on the Atmosphere Correlation coefficient Correlation coefficients Developing countries Environmental monitoring Environmental Monitoring - methods Exposure LDCs Low cost Mitigation Nitrogen Dioxide Outdoor air quality Particulate matter Particulate Matter - analysis Pollutants Pollution levels Pollution monitoring Retention time Uganda Urban areas Urban environments |
title | Characterization of Ambient Air Quality in Selected Urban Areas in Uganda Using Low-Cost Sensing and Measurement Technologies |
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