Which of the following activities can diminish the quality of air?

All of the activities listed can contribute to diminishing the quality of air, making “all of the above” the correct choice.

Working with volatile chemicals on an open bench can release vapors and particulates into the air, increasing air contamination and posing inhalation risks for the individual and potentially others nearby. This practice is particularly dangerous in enclosed or poorly ventilated spaces where the concentration of these chemicals can build up.

Leaving liquid waste containers uncapped can also contribute to air quality issues. When these containers are not sealed, volatile compounds may evaporate into the surrounding environment, leading to carcinogenic or toxic chemical exposure.

Discharging volatile chemicals into the drain is harmful as well, though it primarily affects water quality, it can also lead to the release of harmful vapors if the drainage system releases those substances into the environment.

By recognizing these activities as detrimental to air quality, it’s clear that they collectively pose significant hazards and justify the selection of the comprehensive option addressing them all.