H

Hadrian's Wall - 30 Halocarbons - 114-115

Halons - 115 Hard coal - 3, 22-25, 68 Hazardous air pollutants - 128, 144, 499-503

Health effects - 78, 84, 89, 99-100, 102, 106, 110, 118 Heavy oil - 240 Helmont, Jan van - 247 Herbaceous plants - 4 Hero of Alexandria - 196 Heterogeneous reaction - 207 Homogenous reaction - 207-208 Historic Preservation Act of 1966 - 89 Hoof-and-mouth disease - 463 Horizontal slot-type coke oven - 240 Human health - 77, 96, 104 Humic substances - 3 Hydrated calcium sulfite - 302 Hydrated lime -307, 312, 315, 319 Hydraulic separation - 91-92 Hydroelectric - 34, 50, 54, 58, 68-69, 71 Hydrogen - 74, 447, 462, 468 Hydrogenation - 33 Hydrogen chloride - 307 Hydrogen cyanide - 101 Hydrogen economy - 69, 74 Hydrogen production - 69, 394, 425, 459 Hydrogen storage - 459 Hydrogen utilization - 459 Hydrolysis - 83

Hydrobromofluorocarbons - 115 Hydrochlorofluorocarbons - 114 Hydrofluorocarbons - 115 Hydrorotators - 92

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