Benzo[g,h,i]perylene

Benzo[g,h,i]perylene (BghiP) was first isolated from coal tar in the early 20th century during the systematic chemical characterization of polycyclic aromatic hydrocarbons that identified dozens of related compounds [1]. Unlike benzo[a]pyrene — the most studied PAH — BghiP lacks the 'bay region' that enables reactive diol-epoxide formation, making it less directly mutagenic; however, it is a useful indicator of combustion source pollution because it is consistently present in the PAH mix from diesel, gasoline, coal, and oil combustion [2]. It is highly hydrophobic (Kow ~7) and adsorbs strongly to fine particles (PM2.5), leading to deposition in soils and sediments near roads, airports, and industrial facilities [1]. It is a CERCLA priority pollutant and is monitored by EPA's Toxic Release Inventory [2].

Inhalation of PM2.5-associated BghiP in ambient air near traffic, power plants, and industrial facilities [1]. Dietary intake from grilled/charbroiled foods and grain products grown in contaminated soils [2]. Occupational exposure in asphalt work, chimney sweeping, and vehicle emissions-exposed workers [1]. Soil contact near contaminated sites [2].

BghiP is metabolized to phenolic and quinone intermediates that generate reactive oxygen species and cause oxidative DNA damage, though it is considered less directly mutagenic than benzo[a]pyrene [1]. It acts synergistically with other PAHs in complex combustion mixtures. EPA classifies it as a probable human carcinogen (B2) [2]. As a PM2.5-associated pollutant, it contributes to the cardiovascular and respiratory effects of particulate matter pollution [1].

Urban residents with high traffic exposure [1]. Workers in asphalt paving, roofing, chimney work, and vehicle repair [2]. People living near coal-fired power plants or heavy industrial facilities [1].

1. Reduce time near heavy traffic, particularly during rush hour [1]. 2. Use HEPA air purification indoors during high-pollution days [2]. 3. Reduce charbroiled and grilled food frequency [1]. 4. Occupational workers should use appropriate respiratory protection [2].