Although O3 is elevated during the wheat growing season over
much of central Brazil (Fig.1c), most of this nation’sLike the year
2000 scenario, there is a large range of RYL for wheat because this
crop appears to be resistant to O3 exposure according to the M12
metric, but extremely sensitive to ozone according to the AOT40
index. This discrepancy may be a consequence of the possibility
that wheat is more sensitive to frequent exposure to high O3
concentrations (better captured by AOT40) than to long-term
exposure to moderate ozone concentrations (better captured by the
mean metric) wheat is grown
in the south where O3 exposure is significantly lower.