Missing `Exposure frequency` in conceptual model

[RubenPeeters]

Exposure frequency is defined, but is not part of the model itself. Adding it to Exposure Duration could in my opinion solve the first part of the problem posed by #1. Example:

• Duration = 10 minutes
• Frequency = 300/year
• Δ(start - end) = 1 year
• Contact type: Intermittent

[jwkruisselbrink]

May be picked up together with issue #1 .

[ottenbri]

Are removal processes (e.g. washing hands) sufficiently covered by only defining exposure duration? Same argument goes for retention of compounds (long-lasting, accumulating)