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president obama is doing. that is, though, a four-point improvement over last month. on the top issue this election year, there has been a sharp increase in the number of americans who think the economy is getting worse. that number, 34%, up eight points from last month. and with control of congress at stake, we begin tonight with our congressional correspondent, nancy cordes. >> reporter: pessimism about the economy is deepening. more than eight in 10 americans now say it's bad. >> it's a mess. it's going to get better. it has to get better. >> reporter: like her, 59% of americans t...

welcome back. >> thank you very much. i come back to hot weather though. really hot weather. >> some welcome, huh? >> yeah. so if you plan on working or playing outside, do it early because when the sun comes up, ouch. >> poor air quality for those most susceptible to the ground-based ozone, the young, the elderly, those with respiratory problems. watch out, the santa clara valley and the east bay valleys this afternoon. that's when the buildup of ozone will be the highest. that's also when we'll hit our temperatures that will be most dangerous. mid-90s around the bay shoreline to 10...

this newscast and online at abc7news.com. a fire danger higher than usual. temperatures going up at the same time the air quality is going down. >> absolutely. this is the first spare the air day of the summer and it's going to be dangerously hot in some areas. meteorologist mike nicco is standing by and terry mcsweeney. >> we have two things going on, the excessive heat watch, we are the spare the air day meeting. but if i were to jump in the water in this fountain itould cool me off but i shouldn't mo around too much because the air would be bad for my lungs. >> curtis oldson of li...

captioning sponsored by cbs from cbs news world headquarters in new york, this is the "cbs evening news" with katie couric. >> couric: good evening, everyone, from kabul. as the war in iraq is winding down, the war here in afghanistan is heating up. with the surge ordered by president obama, there are now nearly 100,000 u.s. soldiers and marines here and 40,000 coalition troops. the military reported another death today, bringing the u.s. toll for august to at least 16. as casualties mount, the american public is growing more skeptical. 43% now say the war was a mistake. so why then ...

but we've got to make a lot more, obviously. it's a tough fight. >> couric: after nine years, over $300 billion, 1200 u.s.es lives, not to mention coalition forces and civilian casualties, a lot of americans thinking what the heck are we doing here still? >> well, i can understand that. i mean, it's easy to get frustrated about afghanistan. we should remember why we're here. this is where the 9/11 attacks were planned. it is very much a vital national security interest to the united states and really all the countries of the world that are fighting extremism to make sure that there a...