Final answer:
Children are generally more sensitive to environmental hazards due to their developing bodies and respiratory systems which make them more susceptible to air pollution-related health effects.
Step-by-step explanation:
The type of people generally more sensitive to environmental hazards is children. According to the Environmental Protection Agency (EPA), age is a significant factor affecting sensitivity to environmental hazards. Children and older adults are particularly at higher risk of air pollution-related health effects due to the undeveloped or weakened state of their respiratory systems respectively and the possible presence of pre-existing health conditions. While individual sensitivity can vary dramatically, the overall tendency is for these age groups to exhibit greater vulnerability.