Aerosol Optical depth (AOD) denotes the degree to which aerosols (suspended particles in the atmosphere) prevent the transmission of light by absorption or scattering. AOD indicates spatio-temporal distribution of aerosols affecting the air quality, health hazards, reduced visibility and the heat exchange mechanisms within the earth system. High AOD value (> 0.5) represents increased level of pollution. The INSAT-3D daily mean AOD is a near real-time derived using all INSAT-3D AOD from 0530 GMT to 0830 GMT of that day. The product resolution is 0.1 deg.
Daily PM2.5 μg/m3 represents surface level fine particulate matter (size <2.5 mm) emitted mostly from anthropogenic activities. Geographically Weighted Regression (GWR) is used to estimate regional PM2.5 by combination of INSAT-3D derived AOD, dispersion, source apportionment, meteorology and ground based measurements at 0.125 deg resolution.
Daily PM10 μg/m3 represents surface level fine particulate matter (size <10 mm) emitted mostly from natural sources like mineral dust, fog, mist. Geographically Weighted Regression (GWR) is used to estimate regional PM10 by combination of INSAT-3D derived AOD, dispersion, source apportionment, meteorology and ground based measurements at 0.125 deg resolution.
DESCRIPTION: AQI index has been computed as per standard formulae suggested by Central Pollution Control Board (CPCB). For more details user may refer CPCB report entitled National Air Quality Index, Control of Urban Pollution Series: CUPS/ 82/2014-15 available on CPCB’s, website. Instantaneous AQI estimate based on model forecasted fields has been made available through this web-portal.>
Fire Information for Resource Management System (FIRMS)
Administrative boundary layers from VEDAS
In recent years, an increase in the poor air quality events is noted over Indian region. Particularly Delhi and surrounding region witness severely degraded air quality during post monsoon
and pre-monsoon seasons. Considering alarming situation of deteriorating air quality in India,
an initiative has been taken up at IIRS by synergistic use of numerical prediction
models for the forecasting of dust, particulate matter(PM 2.5 and PM 10) and
gaseous pollutants (CO, O3, SO2, NOx), ground based inputs and remote sensing
data sets of aerosol optical depth and particulate matter (PM 2.5 and PM 10)
to monitor air quality of Indian region in a methodological way. A web portal is hosted at IIRS website to disseminate model generated forecast fields and satellite
based inputs for the monitoring and analysis of air quality over Indian region.
IIRS is a training and education centre of ISRO. Forecast of various air quality parameters available on this web portal is based on numerical weather prediction model being run at IIRS. These forecasts (disseminated through this website) are purely for experimental purpose. Air quality forecast disseminated through this web portal should not be treated as an official forecast. IIRS is not responsible for any damages or loss experienced due to the usage of the information disseminated through this website.
INDIAN INSTITUTE OF REMOTE SENSING,
INDIAN SPACE RESEARCH ORGANISATION
Dept. of Space, Govt. of India
4, Kalidas Road, Dehradun - 248 001 (India)
Tel: + 91 - (0)135 - 2524399 Fax:+ 91 - (0)135 - 2741987