The concentration of carbon monoxide in the breathing areas of workers during logging operations at the motor-manual level.

Objectives: This article compares 2 variants of logging technologies at the motor-manual level: variant A - cutting and delimbing by means of a petrol chainsaw, skidding with the use of a cable winch mounted on a tractor (67-74 kW); variant B - cutting by means of a petrol chainsaw, skidding, debranching and cutting to length by means of a processor aggregated with a farm tractor (61 kW).

Material And Methods: Direct dosimetry and non-parametric (moving block bootstrap) methods were used in order to specify the characteristics of the collected sets.

Results: Bootstrap average values show that the average CO concentration at a skidding tractor operator's station during early thinning was 2.