The environment Pollution is the terrifying issue of this trendy world. A suitable requirement is needed to monitor different environmental pollutions. Many researchers and volunteers are developing and deploying Wireless Sensor Networks (WSN) for this purpose. Internet-of-Things (IoT) is one of the widely used cost-effective technologies to design wireless sensor nodes. A spanking new functional module is initiated in this work to constitute the proposed work named as ‘Secured IoT-WSN Architecture for Environmental Monitoring pollution’(SIAEM) which is indented to overcome some impuissance of applying generalized wireless sensor network architecture in the field of environmental pollution monitoring. The fresh functional module introduced in this work is Dynamic Security Scheme Manager (DSSM). The aim of this projected Secured IoT-WSN architecture is to increase the Security. The impact of proposed method in the performance of Secured IoT-WSN network is measured and stated using benchmark network simulator.