Use respiratory protection, mandatory action sign sign D-M004 according to German standard DIN 4844-2
<a href="//commons.wikimedia.org/wiki/User:DrTorstenHenning" title="User:DrTorstenHenning">Torsten Henning</a>
<b>Vectorization: </b> <a href="//commons.wikimedia.org/wiki/User:DrTorstenHenning" title="User:DrTorstenHenning">Torsten Henning</a>