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This paper aims at measuring and assessing the Indian Cities on the environmental performance criteria across a broad range of categories and supporting indicators. A unique tool is devised for the stakeholders to address the common environmental issues faced by a lot of Indian cities and to help them learn from each other. Metropolitan cities have various Environmental issues such as urban sprawl, loss of green and natural spaces, inadequate water supply, wastewater, solid-waste, pollution of soil and air. In order to counter these problems, the cities have been changing by introducing smart sustainable techniques. Because of these changes, there is competition not amongst various nations but also among various cities in terms of investors, tourists, workmen etc. As a result, recent trends focus on rating system. There are a number of benefits directly attached to the sustainability rating tool like to minimize the city’s environmental footprint, accommodate population growth, and safeguard quality of life of urban dwellers today and in future. It also helps investors to make a choice of their location, helps cities by being a guiding spirit to enlist various strengths and weaknesses of the cities and thereby assisting them in improvement by working on their weaknesses and in defining and planning their goals and to strategize aimed at bolstering their occupied position and to develop plan for the future.

Mesoporous strontium doped ZnO nanoparticles are synthesized as photocatalyst by using zinc nitrate hexahydrate, surfactant P123, strontium nitrate hexahydrate via the hydrothermal process. X-ray diffraction (XRD), UV-visible spectroscopy (UV), Fourier transform infrared (FTIR), Photoluminescence (PL), Energy-dispersive x-ray (EDX), Scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), and Brunauer–Emmett–Teller (BET) characterizations are used for the analysis of all the samples. XRD spectra disclose the disparity in the crystal size 14.98 to 22.74 nm. The study of UV spectroscopy revealed the energy bandgap difference between 3.3–2.92 eV. PL spectroscopy shows the effect of doping on the electron-hole recombination rate of the sample. FTIR analysis has utilized to determine the functional groups such as –OH, C=O=C, and –C–O present in the sample. EDX spectra show the elemental compositions of the sample. SEM images show the agglomerated morphology and TEM images show the different shape morphology of the sample. BET analysis shows the occurrence of 39.9 m2 g−1 surface area with mesoporous morphology. The effect of the increasing percentage of strontium on the photocatalytic capability of ZnO is checked against methylene blue and congo red dyes with 75% and 80% degradation.