Accurate　measurement　of　air　exchange-rates　(AERs)　is　crucial　in　naturally　ventilated　dwellings.　AER　calculations　must　take　into　account　the　multizone　and　time-varying　aspects　to　avoid　significant　deviations　from　reality.　To　address　the　issues　of　invasiveness,　high　cost,　and　inability　to　track　real-time　changes　in　airflow　and　to　represent　real　airflow　patterns　associated　with　the　multiple　tracer　gas　methods,　this　study　proposes　a　practical　and　feasible　approach,　belonging　to　the　occupant-generated　CO2　methods,　for　the　multizone　representation　of　time-varying　airflow　in　naturally　ventilated　dwellings.　In　this　approach,　the　idea　of　state　traversal　is　introduced　to　account　for　all　possible　airflow　patterns.　For　each　airflow　pattern,　the　transient　indoor　CO2　mass　balance　equation　associated　with　Kalman　filter,　and　the　dynamic　simulation　of　indoor　temperature　are　applied　to　successively　determine　the　airflow　pattern　that　is　closest　to　the　actual　pattern.　The　approach＇s　reliability　for　multizone　representation　of　airflow　is　validated　in　controlled　multizone　environments,　and　its　applicability　to　natural　ventilation　of　real　residential　situations　is　also　evaluated.　This　study　further　examines　the　zoning　criterion　and　the　approach＇s　correction　capability,　while　also　providing　a　detailed　analysis　of　its　strengths　and　weaknesses.　©　2024　Elsevier　B.V.