Word: nitrogenating
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...with the dramatic increase in recent years in the release of trace gases, such as chlorofluorocarbons (CFCs), methane, nitrogen oxides and especially carbon dioxide, from industrial sources, the atmosphere is undergoing strains possibly never before experienced in its history...
...compromise proposal would cut emissions of nonmethane hydrocarbons, a key ingredient in smog, which can now average no more than 0.41 gram per mile for a carmaker's fleet. The House action would place a limit of 0.25 gram per mile on all cars by 1996; the output of nitrogen oxide, another source of smog, would be required to fall from 1 gram per mile to 0.4 gram. Unless the Environmental Protection Agency ruled otherwise, automakers would then be ordered to slash the reduced levels in half...
...which are the strictest in the U.S. and will become even tighter in the 1990s, when they are to serve as models for the rest of the country. Such 1989 cars as the South Korean-built Pontiac LeMans and Japan's Nissan Maxima emit less than 0.2 gram of nitrogen oxide per mile. At the same time, Chrysler sells its California dealers a $100 pump that helps cars meet restrictions by recirculating exhaust through the engine and catalytic converter to reduce toxic emissions...
...quite surprised when my lab instructor told us we had to buy liquid nitrogen; in the U.S.S.R. we just take it," Putilina said...
...scientific interest is Neptune's rings. Indirect evidence suggests that they exist, but as arcs rather than true rings. Voyager's photographs may help explain how they formed. The space probe will also examine reddish Triton, whose methane atmosphere is believed to overlie a surface puddled with liquid nitrogen...