With the asthma, have you already tried a heavy-duty mask of doom when you're doing building projects or cleaning? The one I have cost about £30 from a DIY store and filters out PM10 (particles smaller than 10 micrometres - the ones which can get into the lungs) and organic solvents up to some pretty high concentration. You sweat like hell under it but this is ok if you can go into another room and wipe the mask/your face with a thin towel every 20 minutes or so. (If it's relatively low-dust work, you can even leave the towel in the same room and just hold your breath for 30 seconds or so).
I also recommend extensive use of saline nasal sprays. This helps to stop particles getting into your breathing system to start with.
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With the asthma, have you already tried a heavy-duty mask of doom when you're doing building projects or cleaning? The one I have cost about £30 from a DIY store and filters out PM10 (particles smaller than 10 micrometres - the ones which can get into the lungs) and organic solvents up to some pretty high concentration. You sweat like hell under it but this is ok if you can go into another room and wipe the mask/your face with a thin towel every 20 minutes or so. (If it's relatively low-dust work, you can even leave the towel in the same room and just hold your breath for 30 seconds or so).
I also recommend extensive use of saline nasal sprays. This helps to stop particles getting into your breathing system to start with.