Air pollution consists of gaseous, liquid, or solid substances that, when present in sufficient concentration, for a sufficient time, and under certain conditions, tend to interfere with human comfort, health or welfare, and cause environmental damage.
Six common air pollutatnts are:
1. Particle Pollution (particulate matter)
2. Ground-level ozone.
3. Carbon monoxide.
4. Sulfur oxides.
5. Nitrogen oxides.
6. Lead.


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eLearn is the official repository of digitized textbooks of Punjab. Each book has been augmented with Video Lectures, Illustrations, Animations, Simulations, and Interactive Assessments. Through this website, you can access Science and Maths textbooks for Grade 1-12. eLearn is developed by Punjab Information Technology Board in collaboration with Punjab Curriculum & Textbook Board and the School Education Department.
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