Search

We apply a two-step data driven approach to determine the causal impact of the clean air zone (CAZ) policy on air quality in Birmingham, UK. Levels of NO2, NOx and PM2.5 before and after CAZ implementation were collected from automatic air quality monitoring sites both within and outside the CAZ. We apply a unique combination of two recent methods: (1) a random forest machine learning method to strip out the effects of meteorological conditions on air pollution levels, and then (2) the Augmented Synthetic Control Method (ASCM) on the de-weathered air pollution data to isolate the causal effect of the CAZ. We find that, during the first year following the formal policy implementation, the CAZ led to significant but modest reductions of NO2 and NOX levels measured at the roadside within (up to 3.4% and 5.4% of NO2 and NOX, respectively) and outside (up to 6.6% and 11.9%) the zone, with no detectable changes at the urban background site outside the CAZ. No significant impacts of the CAZ were found on concentrations of fine particulates (PM2.5). Our analysis demonstrates the short-term effectiveness of CAZ in reducing concentrations of NO2 and NOX. [ABSTRACT FROM AUTHOR]

This paper examines and quantifies the complex linkages between industrial activity, environmental regulations and air pollution. Couched in terms of the demand for, and the supply of, environmental services we utilize a new dataset of UK industry specific emissions for a variety of pollutants between 1990 and 1998. Our analysis allows us to investigate the role played by different determinants of emissions intensity. We find pollution intensity to be a positive function of energy use and physical and human capital intensity. Conversely, we find pollution intensity to be a negative function of the size of the average firm in an industry, the productivity of an industry and the industry's expenditure on capital and research and development. Our results also indicate that regulations, both formal and informal, have been successful in reducing pollution intensity. [ABSTRACT FROM AUTHOR]

The article demonstrates the need for a sophisticated analysis to quantify air quality impacts of interventions and indicate that true air quality improvements. It mentions that how Covid-19 lockdowns led to major reductions in air pollutant emissions. It discusses about the climatic challenges faced by the Covid-19 pandemic.