Construction is usually discussed as a dust problem. That framing is incomplete and, for the people who manage sites and live beside them, misleading. A construction site is a multi-pollutant source: alongside the visible dust it emits respirable crystalline silica, a spectrum of combustion gases, diesel particulate, and volatile organic compounds. Each behaves differently, poses distinct health risks, is regulated differently, and requires different control strategies.

This whitepaper takes that wider view. It sets out a taxonomy of what construction actually emits and why; maps those emissions to the phases and activities that generate them; explains how each pollutant travels once airborne, from coarse dust that settles within hours to fine particles that persist for days and cross cities1; summarises the human-health and environmental burden, including the occupational exposure limits that govern worker safety; and lays out mitigation matched to each pollutant and phase.

The central idea is that effective control depends on knowing which pollutant is being produced, where, and when. A water bowser suppresses coarse dust but does nothing for solvent vapour or engine exhaust. A low-VOC specification protects a painter but not the groundworker cutting a kerb. Blanket measures waste effort on the wrong risks. This is why real-time, multi-parameter monitoring is the connective tissue of the whole approach: it tells a site which of its many emissions is elevated at any moment, so the right control is applied to the right hazard. Construction's air-quality problem is not one problem; it is several, and managing it well begins with telling them apart.