Paper: GS – III, Subject: Environment and Ecology, Topic: Air Pollution, Issue: Summer Air Pollution in Indian Cities.
Context:
Summer air pollution is increasingly emerging as a major environmental challenge in Indian cities. Contrary to the common perception that air pollution is primarily a winter phenomenon, many cities experience significant deterioration in air quality during summer due to dust storms, ozone formation, vehicular emissions, construction activity and industrial pollution.
Key Takeaways:
Explanation:
Nature of Summer Pollution:
- Summer pollution is mainly associated with PM10 dust particles and ground-level ozone.
- Hot and dry weather loosens soil, increases dust suspension and allows pollutants to travel with strong winds.
- Dust storms, especially from arid regions, can sharply increase PM10 levels in cities.
- Construction activity, road dust, vehicular movement and industrial emissions further worsen air quality.
Difference from Winter Pollution:
- Winter pollution is dominated by PM2.5, smoke and smog due to low temperature, weak winds and temperature inversion.
- In winter, pollutants remain trapped close to the ground.
- In summer, stronger winds may disperse some pollutants, but they also bring dust and resuspend particles.
- Therefore, summer pollution is less about stagnant smog and more about dust transport, heat-driven reactions and ozone formation.
Ozone Formation:
- Ground-level ozone is not emitted directly.
- It forms when nitrogen oxides from vehicles and industries react with volatile organic compounds from fuels, paints and solvents in strong sunlight.
- High temperatures accelerate this reaction, making ozone a major summer pollutant.
- Ozone can irritate the lungs, worsen asthma and reduce respiratory capacity.
Conclusion:
Cities must treat air pollution as a year-round challenge, not only a winter crisis. Summer action should include dust control at construction sites, road cleaning, restrictions on waste burning, cleaner transport, control of industrial emissions and ozone forecasting. Better early-warning systems and city-level heat-pollution plans are essential for protecting public health.
Source: (The Hindu)
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