Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model Two out of the three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 14 points (0.1%) at 15,368 as of Monday, May 20, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 1,885 issues advancing vs. 1,048 declining with 118 unchanged. The Chemicals industry currently sits up 0.5% versus the S&P 500, which is up 0.1%. On the negative front, top decliners within the industry include Valhi ( VHI), down 2.32, Sherwin-Williams Company ( SHW), down 0.85 and PPG Industries ( PPG), down 0.81. A company within the industry that increased today was Mosaic ( MOS), up 1.15. TheStreet Ratings group would like to highlight 4 stocks pushing the industry lower today: 4. Terra Nitrogen Company L.P ( TNH) is one of the companies pushing the Chemicals industry lower today. As of noon trading, Terra Nitrogen Company L.P is down $2.80 (-1.3%) to $215.20 on average volume Thus far, 11,251 shares of Terra Nitrogen Company L.P exchanged hands as compared to its average daily volume of 19,600 shares. The stock has ranged in price between $213.51-$218.00 after having opened the day at $218.00 as compared to the previous trading day's close of $218.00. Terra Nitrogen Company, L.P. engages in the production and sale of nitrogen fertilizer products. It primarily offers anhydrous ammonia and urea ammonium nitrate solutions. Terra Nitrogen GP Inc. serves as the general partner of the company. Terra Nitrogen Company, L.P. Terra Nitrogen Company L.P has a market cap of $4.1 billion and is part of the basic materials sector. The company has a P/E ratio of 12.1, below the S&P 500 P/E ratio of 17.7. Shares are up 1.8% year to date as of the close of trading on Friday. TheStreet Ratings rates Terra Nitrogen Company L.P as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, impressive record of earnings per share growth, expanding profit margins and increase in stock price during the past year. Although the company may harbor some minor weaknesses, we feel they are unlikely to have a significant impact on results. Get the full Terra Nitrogen Company L.P Ratings Report now. Exclusive Offer: Jim Cramer's 'go-to' small/mid-cap guru Bryan Ashenberg only buys stocks he thinks could return 50-100%. See his top picks for 14-days FREE.