To determine the PM2.5 concentration in a classroom a researcher sampled the air over 24 hours. She collected all the airborne particles in a total sample of 14.4 m3 of air. Then she measured the total particle mass in different particle size (diameter) ranges. Her results are shown in this table: What was the PM2.5 concentration in the classroom?

\begin{tabular}{|c|c|} \hline ParticleDiameters(m)) & TotalMassofParticlesCollected(g) \\ \hline 0.00.5 & 350 \\ \hline 0.51.0 & 550 \\ \hline 1.01.5 & 700 \\ \hline 1.52.0 & 950 \\ \hline 2.02.5 & 1050 \\ \hline 2.53.0 & 1150 \\ \hline 3.03.5 & 900 \\ \hline 3.54.0 & 1050 \\ \hline 4.04.5 & 900 \\ \hline 4.55.0 & 950 \\ \hline \end{tabular}