L 31 final


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AIR POLLUTION CONTROL course material by Prof S S JAHAGIRDAR,NKOCET,SOLAPUR for BE (CIVIL ) students of Solapur university. Content will be also useful for SHIVAJI and PUNE university students

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L 31 final

  1. 1. L-31 1. NAAQS and 2. Air Pollution Indices Air Pollution and Control (elective(elective-I)
  2. 2. Understand Air Quality Standards • An air quality standard is the maximum level of atmospheric pollution allowed at one time in a geographical area. • These standards, which are called the National Ambient Air Quality Standards (NAAQS), are set by the CPCB. • These are designed to set limits on the amount of pollution allowed in the air and to force those who pollute the air to stop.
  3. 3. NEW NAAQS 2009
  4. 4. What is the Air Quality Index? • The Air Quality Index (AQI) is an indicator of air quality, based on air pollutants that have adverse effects on human health and the environment. • The pollutants are ozone, fine particulate matter, nitrogen dioxide, carbon monoxide, sulphur dioxide.
  5. 5. Definition • Air pollution Index is defined as a scheme that transforms the (weighted) values of individual air pollution parameters in to a single number or set of number • As a result we get an equation which transforms the parameter values by means of numerical manipulation into simple and precise form
  6. 6. Use of AQI 1. It helps in informing public about air pollution in a particular area. 2. It helps in comparing air pollution levels in different cities 3. It may be used for development for a system for avoidance or management of a severe air pollution episode
  7. 7. Types of Indices Short term indices :- These are usually intended to inform the public about daily changes in air pollution levels. Long term Indices:- These are intended to evaluate changes in air quality over periods of several years or more. These are useful for assessing effectiveness of enforcement of policies
  8. 8. Air Pollution Parameters • • • • • SPM SO2 CO NO2 O3
  9. 9. Criteria for standardised index 1. Easily understood by public 2. Includes major pollutants 3. Calculated in simple manner 4. Rest on reasonable scientific basis 5. Spatially meaningful 6. Consistent with perceived air pollution levels
  10. 10. 7. Exhibit day to day variation. 8. Relate AAQS and goals 9. Relate to episode criteria. 10. Can be forecast a day in advance (If possible)
  11. 11. Determination of index 1) In this method we try to relate the existing pollution levels of various pollutants related to their ambient air quality standards, with the standards being assumed as the reference base line for each pollutants into a percentage of the standard. The air pollution index is then obtained by adding percentages for several pollutants considered.
  12. 12. 2) 2.
  13. 13. 3) In the third method, air pollution index is calculated from five subindices. Each sub-index is obtained by assigning sub-index values for particular ranges of pollutants.
  14. 14. 4) In fourth method, known as the maximum type, only one pollutant index (the highest one) among the several pollutants is reported. 5) In the fifth method only two pollutants i.e. PM and SO2 are taken into account while calculating the air pollution index. 6) In sixth method , only one major pollutant e.g. ozone concentration is taken as basis for reporting air pollution index
  15. 15. Rating scale for indices Index value Remark 0-25 Clean air 25-50 Light air pollution 50-75 Moderate air pollution 75-100 Heavy air pollution > 100 Severe air pollution
  16. 16. Other rating scales 1. Good , acceptable, unsatisfactory, unhealthy 2. Good, satisfactory, unsatisfactory, unhealthful 3. Light , moderate, heavy, alert 4. Good, normal, moderate, heavy, severe
  17. 17. Air Quality Index
  18. 18. Theory questions Q1. Write short notes on 1. NAAQS 2. Air Quality Index (AQI)