Delhi’s fight against smog: From odd‑even traffic rules to cloud‑seeding experiments

Delhi’s battle against smog has entered its third decade, with successive governments layering new tactics on top of earlier schemes. The odd‑even car rule, first rolled out in 2016, limited private vehicles on alternate days based on registration numbers, aiming to cut traffic‑related emissions during winter peaks. While the measure produced a short‑term dip in particulate matter, studies showed the effect faded within weeks as commuters adapted and other sources, such as construction dust and power‑plant output, remained unchecked.

In recent months the municipal and state authorities have turned to cloud‑seeding, a weather‑modification technique that disperses hygroscopic particles into the lower atmosphere to encourage rainfall. Pilot flights over the National Capital Region have been conducted under controlled conditions, with officials hoping that induced showers will wash out suspended pollutants and provide temporary relief during severe haze episodes.

Experts caution that neither odd‑even restrictions nor cloud‑seeding can solve Delhi’s air‑quality crisis on their own. Sustainable improvement will require stricter industrial emission standards, a shift to cleaner fuels, and robust monitoring of construction sites. Until a coordinated, long‑term strategy is in place, the city’s residents are likely to face recurring bouts of unhealthy air.