Can urban afforestation methods such as the Miyawaki technique meaningfully reduce urban heat islands and air pollution? Critically evaluate.

The Miyawaki technique plants dense, layered forests of native species on small urban plots. Bharat Vann, Mysuru, is a recent example: over 2 lakh native trees on 17.63 acres under 'Ek Ped Maa Ke Naam' [1][2]. Such forests do help, but mainly at the local level. They support pollution control; they cannot replace it.

Strengths: where Miyawaki forests help

• Local cooling: a dense, multi-layered canopy shades the ground and cools the air by releasing moisture. Bharat Vann's stated benefits include cooler local temperatures, groundwater recharge and less soil erosion [1].
• Dust capture: thick foliage traps road and construction dust, so urban forests are a dust- and PM-mitigation measure [1].
• Fits crowded cities: it needs little land, so it suits small leftover plots where parks are not possible. Native species also support biodiversity and carbon sequestration [1].
• Policy support: Nagar Van Yojana is building urban forests across cities [3]. Its funds are pooled with the National Clean Air Programme (NCAP) in NCAP cities [4].

Limitations: why the impact stays limited

• Scale: heat islands come from concrete, asphalt, vehicles and waste heat from air-conditioners across the whole city. Cooling from a forest patch stays largely within and near the patch.
• Pollution sources: trees absorb some pollutants after they are emitted. They do not cut emissions from vehicles, industry or crop-residue burning. Under NCAP, PM10 fell in 103 cities in 2024-25 compared with 2017-18 [5], but that result came from many measures together, not from trees alone.
• Benefits not measured: the official claims are expected, not measured. There is no published target for how many saplings must survive and no monitoring plan [1]. Dense planting makes survival the figure that matters.
• Counting trees planted, not trees surviving: mass campaigns report saplings planted [2], which can hide losses from poor upkeep or water stress.

Miyawaki forests help most when they are used alongside other measures, not alone. Cities should map them into heat-vulnerable wards through City Action Plans under NCAP, publish audits of how many trees survive, and pair them with cool roofs, public transport and dust control. Used this way, urban forests can advance SDG 11 (sustainable cities) and Article 48A's commitment to protecting the environment.