14.8. What are the harmful effects of photochemical smog and how can they be controlled? 

<p><strong>Harmful effects of photochemical smog: </strong>Photochemical smog causes serious health problems. Both ozone and PAN (peroxyacetyl nitrate) act as powerful eye irritants. Ozone and nitric oxide irritate the nose and throat and their high concentration causes headache, chest pain, dryness of the throat, cough and difficulty in breathing. Photochemical smog leads to cracking of rubber and extensive damage to plant life. It also causes corrosion of metals, stones, building materials, rubber and painted surfaces.</p><p><strong>Control:</strong></p><ul><li>Control of primary precursors of photochemical smog, such as NO2 and hydrocarbons, the secondary precursors such as ozone and PAN, the photochemical smog will automatically be reduced.</li><li>Use of catalytic converter in automobiles prevents the release of nitrogen oxide and hydrocarbons to the atmosphere.</li></ul><p>Plants like Pinus, juniparus, quercus, pyrus etc. can metabolise nitrogen oxide thus their plantation could help in this matter.</p>

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