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DAILY NEWS ANALYSIS
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09 May, 2020
8 Min Read
Introduction
While traffic pollution has been falling, the lockdown may be leading to the generation of a dangerous pollutant, urban ozone, which can cause airway inflammation in humans.
The research is specific to the UK. It has been conducted by experts from The University of Manchester.
Nitrogen oxides
Levels of nitrogen oxides were found reduced in most locations in the UK during mid-March and April. The level of decline ranges from 20% to 80 %.
Levels of nitrogen oxides fall less in rural areas than in urban areas, and they are higher in the morning than compared later in the day.
PM2.5
There was no evidence of a decrease in PM2.5. These particles are produced by vehicles, they are also known to originate from domestic wood burning and chemical reactions involving emissions from industry and agriculture, so there has been no significant improvement in air quality in that regard.
Urban ozone
The Manchester team speculated that photochemical production of ozone may become more important in urban areas during summertime in these low conditions of oxides of nitrogen.
As nitrogen oxides reduce, photochemical production may become more efficient and can lead to higher ozone concentrations in the summertime as higher temperatures increase emissions of biogenic hydrocarbon from natural sources such as trees.
These biogenic hydrocarbons significantly affect urban ozone levels.
While ozone is important for screening harmful solar UV radiation when present higher up in the atmosphere, it can be a danger at the Earth’s surface and can react to destroy or alter many biological molecules.
Source: IE
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