What is one of the main health topics addressed by PAHO?

The correct choice focuses on "Environmental factors affecting health" as one of the main health topics addressed by the Pan American Health Organization (PAHO). Environmental health is a crucial area of public health because it examines how environmental conditions, such as air and water quality, climate change, and exposure to hazardous substances, influence the health of populations.

PAHO plays a significant role in promoting regional health initiatives that address environmental determinants, recognizing that many health issues stem from environmental factors. By focusing on environmental health, PAHO contributes to improving health outcomes and reducing disease burdens associated with environmental risks.

Other topics, while important, do not reflect the primary focus of PAHO's health agenda as strongly as the consideration of environmental factors does. The organization emphasizes sustainable development and the importance of a healthy environment as integral to ensuring the health of communities across the Americas.