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UPSC Civil Services Examination 2014, Official Cut offs

The official cut offs for the UPSC Civil services Examination 2014, has been declared by UPSC.   Please read these important articles about prelims preparation 1. How UPSC asks current affairs in GS Prelims 2. How to practice prelims MCQs for UPSC 3. Applying logic in UPSC General Studies Prelims ————————————————————————————————————————————————————————    


Primary air pollutants and their sources

What are primary air pollutants (PAPs)? Primary air pollutants (PAPs) are those that are emitted directly into the air from sources. Examples – Sulphur dioxide, nitrogen oxides, carbon monoxide, volatile organic matter, particulate matters, lead, ammonia etc. How PAPs impact environment? They can have effects both directly and as precursors of secondary air pollutants (chemicals formed through reactions in the atmosphere), which are discussed in the following section. What are secondary air pollutants? A secondary pollutant is not directly emitted as such, but forms when… Continue Reading »


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