Xu cited the case of a Tier 2 manufacturer of HVAC flaps that wanted to eliminate post-treatment of parts to achieve a required odor level of <3 VDA 270 with the lowest VOC/ fog level
(VDA 278) at the same compression set as the previous LSR.
In general, the higher elevations are above the fog level
Steve Hammond, a manager at the Fuji Technical Center in Los Angeles, said development of Fuji 800 could be increased by up to one minute (a two-stop push), but after that the fog level
wiped out any increase in highlight density.
Numazawa also calls attention to a peculiarity of the chemistry: "You must be careful not to rinse the film in water between the processing steps, or the fog level
But gas hypering also raises an emulsion's fog level
, which is especially troubling with transparency films.
Airth has been dismissed in the past for weather reasons - it has high fog levels
- but experts say that by the time a new airport is built, aircraft and air traffic control tech- nology will be able to cope with the elements.
Brodie suggested a number of reasons as to why the fog levels
had begun to fall by 1900: the success of the Coal Smoke Abatement Society; modern grates and stoves that were more efficient at burning the smoke; the introduction of incandescent gas and electric lights; and the increasing use of gas stoves for heating and cooking.
The EPA believes the Clean Air Act's directive that standards be set at a level protective of public health with an adequate margin of safety would prevent it from setting the standard at the London fog levels
and from regulating to prevent insignificant effects.