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Ground-level ozone (O3) is a major
component of smog. Although the same
molecule, ground-level ozone can be
harmful to human health, unlike
stratospheric ozone that protects the
earth from excess UV radiation.
It is formed from photochemical
reactions with pollutants such volatile
organic compounds, carbon monoxide
and nitrogen oxides (NO,) emitted from
vehicles, and industry. Due to the
photochemical nature, the highest levels
of ozone are seen during periods of
sunny weather.
Exposure to excessive ozone can cause
problems breathing, trigger asthma,
reduce lung function and lead to lung
disease.
Ozone if formed usually when UV rays hit Oxygen(O2), and if forms protective ozone layer high up in atmosphere. But ground level ozone like this are formed from other pollutants in the presence of sunlight. That is factory and vehicle's pollutants react on sunlight and creates ozone which is harmful