# Ambient Air Quality at Epe & Olusosun Dumpsites, Lagos — Okafor et al. (2024)

**Citation:** Okafor, C.L., Chukwu, F.S. & Ahove, M.A. (2024). Comparative assessment of air quality in Epe, and Olusosun dumpsites of Nigeria. *Journal of Agriculture and Environmental Sciences*, 9(1). DOI: https://doi.org/10.20372/jaes.v9i1.9053

**Link:** https://ejol.aau.edu.et/index.php/JAES/article/view/9053

**Relevant quotes / tables:**

> "A 60-minute exposure time was observed with each of the instruments (AEROQUAL 500 Series) to measure Carbon dioxide (CO2), Methane (CH4), Oxides of nitrogen (NOx), Sulfur dioxide (SO2) and Carbon monoxide (CO) and sizes of suspended particulate matter (PM2.5 and PM10.0) were measured using handheld particulate matter monitoring equipment."

Extracted measured ranges:

| Parameter | Epe dumpsite | Olusosun dumpsite | Note |
|-----------|--------------|-------------------|------|
| CO₂ | 768.5–810 ppm (morning); 789.6–795 ppm | 790–1,094 ppm | Ambient background ~420 ppm; elevated near waste |
| CH₄ | 0–24 ppm | up to 146 ppm | Olusosun much higher (older, larger, more organic waste) |
| NOx | 0.0–0.017 ppm | 0.003–0.017 ppm | Below 0.04–0.06 ppm standard |

**What it feeds:**
- Qualitative evidence of active landfill-gas/methane emissions at Lagos dumpsites.
- Not a direct emission factor; supports need for methane-capture/control measures.

**Confidence:** Low for quantitative emission estimates — single-day snapshot, 10 am–1 pm, October 2022.

**Limitations:** No waste-throughput data, no flux measurements, no oxidation factor derived.