Smoke from fireworks consists mainly of fine toxic dusts (particulate matter) that can easily enter the lungs.
This represents a real threat for people with asthma or multiple chemical sensitivity (MCS). Smoke from fireworks combustion may contain a mixture of sulfur-coal compounds, traces of heavy metals, and other toxic chemicals or gases. The combustion cloud can contain harmful fumes such as ozone, sulfur dioxide and nitric oxide.
Smoke from consumer fireworks is of most concern because they are released at a low level which makes inhalation more likely compared to professional displays. Additionally, in this time where the issues of climate change and global warming are being presented with a sense of urgency, we need to be concerned about the greenhouse gases fireworks produce, which include Carbon dioxide (CO2) and ozone.