begin quote from AI Overview
Ground-level
ozone (O₃) has emerged as one of the most critical threats to
agriculture across Asia and Africa, with models confirming an additional
20% potential yield reduction for highly sensitive crops like wheat in India.
Unlike stratospheric ozone which protects the earth, tropospheric
(ground-level) ozone acts as a powerful oxidizing agent that enters
plant stomata, disrupts photosynthesis, and severely stunts crop
development.
Key Impacts on Regional Agriculture
- The Vulnerability of Wheat: Crop exposure models show that wheat is exceptionally sensitive to ozone pollution. Under high-emission pathways, models project an additional 20% yield loss for wheat in India, alongside a roughly 7% reduction for rice and maize.
- Hotspots of Risk: The Indo-Gangetic Plain (IGP) and Central India
face the worst exposure windows. In these agricultural heartlands, safe
ozone exposure thresholds (such as the AOT40 index) are projected to be
exceeded by up to six-fold due to intense solar radiation acting on precursor emissions like nitrogen oxides () and volatile organic compounds (VOCs).
- Compounding Food Insecurity: Studies evaluating the mitigation of greenhouse gases emphasize that cutting ozone precursors globally would disproportionately protect Sub-Saharan Africa and India. Successful ozone reductions are projected to rescue millions of people from ozone-driven hunger risks by safeguarding regional calorie availability.
The "Ozone-Climate Penalty"
The
crisis is heavily amplified by climate change. Rising global
temperatures and prolonged heatwaves accelerate the chemical reactions
that transform vehicular and industrial emissions into surface ozone.
Compounding this, local agricultural practices—such as crop residue
burning—can temporarily spike regional ozone concentrations by up to 20
parts per billion (ppb), hitting crops precisely during critical
grain-filling stages.
Potential Mitigation Strategies
Jul 24, 2023 — This “bad” ground-level ozone carries serious risks to human and crop health. ... a particularly serious threat to the subcontinent and South Asia ...
Missing: Africa models 20% losses 2030.
by KS Anagha2026Cited by 1 — Rising levels of surface ozone (O3) in the arable ecosystem have emerged as a serious threat to food security by reducing the yield of major ...
Missing: Asia Africa face projected models warning 20% 2030.
Jul 5, 2026 — Ground-level ozone is emerging as one of India's fastest-growing air pollution threats. ... serious risks to public health, agriculture, and the ...
A new study by IIT Kharagpur warns that ozone pollution is an under-recognised but serious threat to India's agriculture.
Sep 16, 2020 — The toxic threat of ozone at ground level ... Basic food crops for millions of people worldwide are endangered because of surging ground-level ...
Sep 8, 2014 — India could feed 94 million people with the lost wheat and rice crops ... level ozone, a significant threat to human health and crop productivity.
Missing: Asia Africa face severe warning 20% 2030.
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