But concentrations alone are insufficient to evaluate potential damage to plants.
Plants are less sensitive at night and during periods of slower growth.
Temperature and moisture conditions also affect sensitivity. Consequently, we must measure actual O 3 absorption to assess effects on plants. This approach allows almost continuous measurement of O 3 flux and provides daily and seasonal patterns of absorption. Figure 26 Ozone absorbed and water transpired by soybean on a sunny day in August in Ottawa. Aerial O 3 surveys have already been made for many crops, weather conditions, and O 3 concentrations.