Ozone Pollution : A recent analysis by the Centre for Science and Environment (CSE) has revealed dangerously high levels of ground-level ozone pollution across Delhi-NCR during the summer of 2025.
o Ozone Surpasses PM2.5: Ozone became the lead pollutant in Delhi’s AQI for an extended period, overtaking fine particulate matter.
o Persistent Night-Time Pollution: Ozone levels stayed high into the night, averaging 14–15 hours of exceedance daily. Gwal Pahari (Gurugram) had the most night-time spikes.
o Health & Agricultural Risks: Ozone exposure can trigger respiratory issues and worsen lung diseases. Ozone drifts into rural areas, potentially harming crop yields and food security.
o Good Ozone (Stratospheric Ozone): Located in the stratosphere (6 to 30 miles above Earth).
ü Forms the ozone layer, which protects life by blocking harmful ultraviolet (UV) rays from the sun.
o Bad Ozone (Ground-Level Ozone): Found in the troposphere (Earth’s surface up to ~6 miles high).
ü Formed by chemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOCs) in sunlight.
ü A key component of urban smog.
ü Harmful to human health (causes respiratory issues) and damaging to crops, forests, and other vegetation.
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