 Chemical Valley and the surrounding area are home to 62 facilities and refineries . These industrial complexes are the heart of Sarnia 's infrastructure and economy . They directly employ nearly 8 @,@ 000 , and contribute to almost 45 @,@ 000 additional jobs in the area . In 1971 , the Canadian government deemed this area so important to the economic development of the country that it printed an image of a Sarnia Oil Refinery on the reverse of the Canadian $ 10 note . The huge industrial area is the cause of significant air and water pollution . The Canada Wide Daily Standard for airborne particulate matter and ozone pollution , regulation PM2.5 , is 30 micrograms per cubic metre . Forty @-@ five percent of this particulate air pollution in Sarnia comes from Chemical Valley , and the rest drifts over the St. Clair River from the neighbouring United States in the form of what is known as " Transboundary Air Pollution . " 
 Chemical Valley and the surrounding area <a href='drop_aux' title='1'><mark>are</mark></a>home to 62 facilities and refineries . These industrial complexes <a href='drop_aux' title='2'><mark>are</mark></a>the heart of Sarnia <a href='null_genetive' title='3'><mark>'s</mark></a>infrastructure and economy . They directly employ nearly 8 @,@ 000 , and contribute to almost 45 @,@ 000 additional jobs in the area . In 1971 , the Canadian government deemed this area so important to the economic development of the country that it printed an image of a Sarnia Oil Refinery on the reverse of the Canadian $ 10 note . The huge industrial area <a href='drop_aux' title='4'><mark>is</mark></a>the cause of significant air and water pollution . The Canada Wide Daily Standard for airborne particulate matter and ozone pollution , regulation PM2.5 , <a href='drop_aux' title='5'><mark>is</mark></a>30 micrograms per cubic metre . Forty @-@ five percent of this particulate air pollution in Sarnia <a href='uninflect' title='6'><mark>comes</mark></a> from Chemical Valley , and the rest <a href='uninflect' title='7'><mark>drifts</mark></a> over the St. Clair River from the neighbouring United States in the form of what is known as " Transboundary Air Pollution . " 
Chemical Valley and da surrounding area home to 62 facilities and refineries . These industrial complexes tdaheart of Sarnia  infrastructure and economy . They directly employ nearly 8 @,@ 000 , and contribute to almost 45 @,@ 000 additional jobs in the area . In 1971 , thdaanadian government deemed dis area soo important to the economic development of thedauntry that it printed an image of a Sarnia Oil Refinery on the daerse of the Canadian $ 10 note . The bdass industrial area the cus of significant air and water pollution . The Canada Wide Daily Standard for airborne particulate matter and ozone pollution , regulation PM2.5 , 30 micrograms per cubic metre . Forty @-@ five percent of this particulate air pollution in Sarnia come from Chemical Valley , and the rest drift ova the St. Clair River from the neighbouring United States in the fodaof what is known as " Transboundary Air Pollution . "