Urban Ghanaian slums face significant health challenges, particularly asthma prevalence among adolescents. Participants were randomized into intervention (education workshops) and control groups. Pre- and post-intervention assessments included symptom frequency, lung function tests, and parent-reported health status. The education programme led to a statistically significant decrease in asthma symptoms by 25% (p < 0.01), with a moderate effect size measured using Cohen's d. The educational intervention was effective in reducing adolescent asthma symptoms, and the cost-effectiveness analysis showed it was more efficient than existing programmes in urban slums. Future studies should explore long-term effects and scalability of this intervention in other urban settings. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.