Increasingly strict controls and eventual elimination of lead-based "anti-knock" additives in gasoline are the uncontested cause of the two-orders-of-magnitude decrease in airborne Pb in the USA since the 1970s [1].
A recommendation was made that night that glider landings should be considered only when an emergency existed, and that otherwise gliders should take off during the night and land during daylight to avoid the wide dispersal of airborne troops and a decrease in efficiency.
"Ivan took a decrease in compensation last year.
"There is a decrease in fidelity".
In decay experiments, upper-room UVC fixtures used with mixing by a conventional ceiling fan produced decreases in airborne virus concentrations that would require additional ventilation of more than 87 air changes per hour.
We demonstrate through aerosol decay experiments that upper-room UVC fixtures used with mixing provided by a conventional ceiling fan and minimal general ventilation produced decreases in airborne virus concentrations that would require additional ventilation of more than 87 ACH.
It is likely that at least some of this change, particularly over Europe, is due to decreases in airborne pollution.
To achieve further decreases in airborne lead, what sources would need to be decreased and what costs would ensue?
