Abstract: The novel corona virus is one of those viruses recently identified from Wuhan city of China and spread around 200 nations which causes severe acute respiratory syndromes similar to corona virus -2(SARS COVID 2) which has spread widely through human-to-human contact and was declared pandemic by the WHO in March 2020. It is offering the entire world to go for lockdown of most countries and halt business activities like IT sectors free moment of people from one place to another place interstate and intra state however there is various positive outcome due to covid 19 on the environment. First phase was 20 days which was complete lockdown, Phase second, April 15 - 2020, Phase third, 4 May -2020, Phase 4 1st May 2020 have resulted in sufficient improvement in air quality in the country, as revealed by data analysis and comparison of data for time before enforcement of restriction the major sector contributing to air pollution are transport industries, power plants, construction activities, biomass and refuse burning, road dust resuspension and residential activities. Air quality improvement has been noted in many towns and cities across the nations, authors studied the difference in air quality Index AQI Uttar Pradesh Meerut from 15 February 2020 to 7 May 2020. The AQI was calculated by combination of in divided sub individual of seven pollutants, namely PM2.5, PM10, NO2, SO2, CO and O3 collected from central board website. Overall, significant improvement in the air quality was observed during the lockdown which led to better climatic condition, lessor pollution and asthma and their cardia-respiratory issues in people. In this paper, authors tried to discuss the various researchers’ opinion about impact of Covid – 19 on air quality during the lockdown period in India.

Keywords: Covid-19, Air quality standard, Lockdown, Air Pollution.

| DOI: 10.17148/IARJSET.2021.86132