Suggested reading material for Dr Steven E. Jones.

DIESEL EXHAUST
Composition
Diesel exhaust is composed of gases and microscopic solids. The most significant gases
are carbon monoxide (CO), carbon dioxide (CO
2
), hydrocarbons (HC), nitrogen oxides
(NO
x
), and sulfide oxides (SO
x
). The solid particulate matter (PM) is mainly composed
of unburned fuel and oil in addition to other possible 18,000 substances

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Firestops
Silicone foams have been used usually in North American buildings in an attempt to firestop openings within fire-resistance-rated wall and floor assemblies to prevent the spread of flames and smoke from one room to another.
The Israeli installation subsequently switched to an "elastomer" version of this product, which avoids most safety concerns associated with the foamed version.
Silicone foam firestops have been the subject of controversy and press attention due to smoke development from pyrolysis of combustible components within the foam, hydrogen gas escape, shrinkage and cracking. These problems have been exposed by whistleblower Gerald W. Brown and have led to a large number or reportable events among licensees (operators of nuclear power plants) of the Nuclear Regulatory Commission (NRC).
When properly installed, silicone-foam firestops can be fabricated for building code compliance. Advantages include flexibility and high dielectric strength. Disadvantages include combustibility (hard to extinguish) and significant smoke development

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