  From 21 independent Baryon Acoustic Oscillation (BAO) measurements we obtain
the following sum of masses of active Dirac or Majorana neutrinos: $\sum m_\nu
= 0.711 - 0.335 \cdot \delta h + 0.050 \cdot \delta b \pm 0.063 \textrm{ eV,}$
where $\delta h \equiv (h - 0.678) / 0.009$ and $\delta b \equiv (\Omega_b h^2
- 0.02226) / 0.00023$. This result may be combined with independent
measurements that constrain the parameters $\sum m_\nu$, $h$, and $\Omega_b
h^2$. For $\delta h = \pm 1$ and $\delta b = \pm 1$, we obtain $m_\nu < 0.43$
eV at 95\% confidence.
