Question

1. which of the following is one of the greatest indoor air problems globally?

a. cigarette smoke \tc. metal lead
b. dust & fine aerosols \td. cooking fires

Explanation:

To determine the greatest indoor air problem globally, we analyze each option:

• Option a (cigarette smoke) is an indoor air pollutant but not the greatest globally.
• Option b (dust & fine aerosols) includes various particles but is not the primary global indoor air issue.
• Option c (metal lead) is a contaminant but more related to lead exposure (e.g., paint, water) than indoor air.
• Option d (cooking fires) is a major indoor air problem, especially in regions using solid fuels for cooking, contributing to high levels of harmful pollutants (e.g., PM2.5, CO) and affecting billions globally.

Answer:

d. cooking fires