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Related Concept Videos

Sampling Plans01:23

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
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Related Experiment Video

Updated: May 3, 2026

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
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Ambient PM2.5 temporal variation and source apportionment in Mbarara, Uganda.

Silver Onyango1, Crystal M North2,3,4, Hatem A Ellaithy2

  • 1Mbarara University of Science and Technology, Mbarara, Uganda.

Aerosol and Air Quality Research
|July 1, 2024
PubMed
Summary

Air pollution in Uganda, particularly fine particulate matter (PM2.5), significantly exceeds global air quality standards. Key pollution sources identified include traffic and biomass burning, necessitating targeted mitigation strategies for public health.

Keywords:
AfricaAir pollutionAir qualityBiomassResource-limited setting

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Area of Science:

  • Environmental Science
  • Public Health
  • Atmospheric Chemistry

Background:

  • Air pollution is a leading global environmental health risk, disproportionately affecting resource-limited regions like sub-Saharan Africa.
  • Limited data exists on ambient air quality and pollutant sources in many African nations, including Uganda.
  • Existing Ugandan studies often overlook non-urban areas and detailed source apportionment of fine particulate matter (PM2.5).

Purpose of the Study:

  • To quantify daily ambient PM2.5 concentrations in Mbarara, Uganda.
  • To identify and characterize the primary sources contributing to PM2.5 pollution in Mbarara.
  • To compare air quality in Mbarara with Kampala and World Health Organization (WHO) guidelines.

Main Methods:

  • Daily ambient PM2.5 was measured using Harvard impactors from May 2018 to February 2019.
  • PM2.5 sources were identified using X-ray fluorescence and positive matrix factorization.
  • Data was compared between Mbarara and Kampala, and against WHO air quality benchmarks.

Main Results:

  • Mbarara's average PM2.5 concentration was 26.7 μg/m³, significantly lower than Kampala's 59.4 μg/m³ but still exceeding WHO guidelines on 58% of days.
  • PM2.5 levels in Mbarara were higher during the dry season (30.8 μg/m³) compared to the rainy season (21.3 μg/m³).
  • The dominant PM2.5 sources in Mbarara were traffic-related emissions, biomass burning, secondary aerosols, industry, heavy oil combustion, soil, and salt aerosols.

Conclusions:

  • Air quality in Mbarara, Uganda, is substantially impaired, posing significant public health risks.
  • Urgent mitigation interventions are required, with a focus on reducing emissions from traffic and biomass burning.
  • Addressing these primary sources is crucial for improving air quality in southwestern Uganda.