Titanium dioxide in nanoform is one of the most widely used nanomaterials, it can be found in solar creams due to its UV absorption capacity and as antifogging coatings and self-cleaning windows due to its photocatalytic sterilizing properties. It is also found as additives in paints, plastics, cements… thus it represents a major source of potential exposure in the workplace. ANSES has published a report recommending an occupation al exposure limit (8h OEL) of 0.80 µg/cm3. Compliance with this value should help prevent lung inflammation, an effect that has been observed at different TiO2 exposure concentrations. ANSES also recommends not exceeding the concentration of 4 µg/cm3 over a 15-minute period. Compliance with this value should help limit the size and number of exposure peaks over the working day. An evaluation of different methods for measuring TiO2 nanoparticles is on-going to identify which methods to use to determine TiO2 nanoparticle concentration in air.

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