Sentence examples for ppm during the from inspiring English sources

Nevertheless, it is likely that these concentrations reached several ppm during the PETM.

Lead concentrations increased from less than 10 parts per million (ppm) up to about 60 ppm by 330 bc and then exceeded 100 ppm during the swift expansion of Alexandria.

The CO concentration remained below 10 ppm during the test period and confirmed the stable performance of the two-stage PrOx reactors.

An oxygen sensor is used to monitor any remaining oxygen, which was found to average 225 ± 30 ppm during the several days of plant operation.

Carbon dioxide levels are now in uncharted territory, the scientists say: Ice core records reveal that until the early 20th century, CO2 concentrations hadn't risen above 300 ppm during the previous 800,000 years).

Also noteworthy is the rather low SO4 2− concentration, which averaged 25.1 ± 13.7 ppm during the period May September (only data for August and September are shown) with occasional spikes as high as ~50 ppm.

For reasons unknown, atmospheric concentrations of the gas rose by about 700 parts per million, from 1000 ppm to 1700 ppm--more than four times higher than today's level of 385 ppm--during the PETM.

In addition, the possibility of interaction with the PPMs during the SIP enabled students to reinforce physiological concepts, since most of the presentations required the presenter or the spectator to touch or handle the physical models, ultimately addressing multiple learning styles.

They even simulated what would happen to global temperatures when they increased the atmosphere's sensitivity to doubling CO2 levels--to 2000 ppm--during the PETM.

Fallon cottonwoods had an average of 60 ppm during this same period.

The atmospheric CO2 concentration of 390 ppm in 2014 far exceeded the range (180 300 ppm) observed during the last 650,000 years, and the use of fossil fuels was its major source.